Introduction and literature review
Introduction
Literature review
Phase name [This work] | Common names | Pearson symbol | Structure prototype | T. range (°C) |
---|---|---|---|---|
α (Al) | FCC_A1, Al | cF4 | Al | ≤ 660.5 |
α (Cu) | FCC_A1, Cu | cF4 | Cu | ≤ 1083 |
α (Zn) | HCP_Zn, Zn | hP2 | Mg | |
θ | θ, Al2Cu | tI12 | Al2Cu | ≤ 590.5 |
η | η1_AlCu, Eta HT | oP16/oC16 | n.a. | 573.9-624.5 |
η′ | η2_AlCu, Eta LT | mC20 | AlCu | ≤ 574.5 |
ζ | ζ2, Al3Cu4-δ | Imm2 | Al3Cu4−δ | 373–597 |
ζ′ | ζ1, Al3Cu4 | Fmm2 | Al3Cu4 | min. 300–560.5 |
ε | ε1_AlCu, epsilon HT | cubic? | n.a. | 959–846 |
ε′ | ε2_AlCu, epsilon LT | hP4 | NiAs | 846–568.5 |
δ | δ, Al5Cu8 | hR52 | Al4Cu9 (r) | ≤ 680 |
γ | γ0, γ_CuZn, γ_brass | cI52 | Cu5Zn8 | 991–779.6 |
γ′ | γ1, γ_AlCu, γ_D83 | cP52 | Al4Cu9 | ≤ 873.5 |
β | BCC_A2 (AlCu) | cI2 | W | 1052–566.7 |
α’ | α2_AlCu, alpha_LT | n. a. | super structure based on TiAl3 | ≤ 360 |
β’ | BCC_B2, CuZn | cP2 | CsCl | ≤ 468 |
δ1 | CuZn3 | hP3 | CuZn3 | 700–560 |
ε1 | CuZn4 | hP2 | Mg | ≤598 |
τc | τ, Cu5Zn2Al3 | cP2 | CsCl | ≤ 740 |
τi | Incommensurate τ phase | ≤ 550* | ||
τr | τ′ | hR9 | superstructure of CsCl | < 440* |
Experimental
Sample preparation
T [°C]_No. | Annealing time [h] | Overall composition (at. %) | Coexist. phases | Phase 1 (at. %) | Phase 2 (at. %) | Phase 3 (at. %) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Al | Cu | Zn | Al | Cu | Zn | Al | Cu | Zn | Al | Cu | Zn | |||
300_1 | 700 | 14.3 | 48.8 | 36.9 | γ + γ′ | 10.5 | 44.2 | 45.3 | 21.0 | 53.5 | 25.5 | – | – | – |
325_1 | 700 | 15.1 | 48.6 | 36.3 | γ + γ′ | 11.0 | 45.1 | 43.9 | 20.1 | 53.2 | 26.7 | – | – | – |
350_1 | 700 | 14.9 | 48.2 | 36.9 | γ + γ′ | 11.4 | 47.0 | 41.6 | 18.5 | 52.4 | 29.1 | – | – | – |
375_1 | 700 | 16.9 | 50.8 | 32.3 | γ + γ′ | 12.2 | 46.7 | 41.1 | 17.8 | 52.4 | 29.8 | – | – | – |
400_1 | 648 | 21.0 | 39.0 | 40.0 | τc+ ε1 | 29.9 | 46.7 | 23.4 | 17.9 | 36.4 | 45.7 | – | – | – |
400_2 | 648 | 42.4 | 52.3 | 5.3 | ζ + η′ | 45.3 | 51.7 | 3.0 | 41.9 | 52.0 | 6.1 | – | – | – |
400_3 | 648 | 14.3 | 61.6 | 24.1 | γ′ + β’ | 22.2 | 61.7 | 16.1 | 10.9 | 61.8 | 27.3 | – | – | – |
400_4 | 648 | 53.6 | 42.5 | 3.9 | η′+ τr+ θ | 47.8 | 50.2 | 2.0 | 55.3 | 40.0 | 4.7 | 65.4 | 34.0 | 0.6 |
400_5 | 648 | 47.6 | 47.7 | 4.8 | η′+ τr | 46.59 | 49.61 | 3.80 | 53.1 | 41.0 | 5.9 | – | – | – |
400_6 | 648 | 26.1 | 34.8 | 39.1 | τi + ε1 | 42.3 | 42.6 | 15.1 | 13.3 | 30.3 | 56.4 | – | – | – |
400_7 | 648 | 18.6 | 42.9 | 38.5 | τc + γ + ε1 | 25.6 | 49.1 | 25.3 | 15.7 | 44.4 | 39.9 | 15.4 | 36.8 | 47.8 |
400_8 | 648 | 32.8 | 47.8 | 19.4 | τc | 32.8 | 47.8 | 19.4 | – | – | – | – | – | – |
400_9 | 648 | 37.4 | 46.0 | 16.6 | τi | 37.4 | 46.0 | 16.6 | – | – | – | – | – | – |
400_10 | 648 | 42.4 | 44.1 | 13.5 | τi | 42.4 | 44.1 | 13.5 | – | – | – | – | – | – |
400_11 | 625 | 48.4 | 41.7 | 9.9 | τr | 48.4 | 41.7 | 9.9 | – | – | – | – | – | – |
400_12 | 625 | 29.1 | 57.5 | 13.4 | δ + τc | 29.4 | 59.3 | 11.3 | 28.4 | 50.9 | 20.7 | – | – | – |
400_13 | 625 | 38.6 | 55.8 | 5.6 | δ + ζ′ | 35.8 | 59.8 | 4.4 | 41.0 | 52.5 | 6.5 | – | – | – |
400_14 | 625 | 15.8 | 49.7 | 34.5 | γ + γ′ | 15.8 | 49.2 | 35.0 | 17.4 | 51.0 | 31.6 | – | – | – |
400_15 | 625 | 13.8 | 48.2 | 38.0 | γ | 13.8 | 48.2 | 38.0 | – | – | – | – | – | – |
400_16 | 625 | 11.8 | 46.3 | 41.9 | γ | 11.8 | 46.3 | 41.9 | – | – | – | – | – | – |
400_17 | 612 | 16.4 | 51.6 | 32.0 | γ′ | 16.4 | 51.6 | 32.0 | – | – | – | – | – | – |
400_18 | 612 | 42.9 | 48.3 | 8.8 | η′+ τr | 42.9 | 49.6 | 7.5 | 44.7 | 43.8 | 11.5 | – | – | – |
400_19 | 612 | 38.2 | 50.7 | 11.1 | ζ′+ τi+ δ | 40.4 | 50.3 | 9.4 | 34.3 | 48.4 | 17.3 | – | – | – |
400_20 | 612 | 31.9 | 58.0 | 10.1 | δ + τc | 32.0 | 59.5 | 8.5 | 30.3 | 51.0 | 18.7 | – | – | – |
400_21 | 612 | 28.1 | 40.8 | 31.1 | τi + ε1 | 35.6 | 46.1 | 18.3 | 13.4 | 32.0 | 54.6 | – | – | – |
400_22 | 612 | 9.8 | 36.6 | 53.6 | γ + ε1 | 9.5 | 40.2 | 50.4 | 10.5 | 32.4 | 57.0 | – | – | – |
400_23 | 612 | 5.7 | 55.3 | 39.0 | β | 5.7 | 55.3 | 39.0 | – | – | – | – | – | – |
400_24 | 612 | 37.5 | 14.8 | 47.7 | τr + L | 51.1 | 40.2 | 8.7 | 35.0 | 8.6 | 56.4 | – | – | – |
400_25 | 660 | 29.4 | 21.8 | 48.8 | τr + L+ε1 | 50.3 | 40.3 | 9.4 | 31.0 | 8.0 | 61.0 | 8.8 | 23.6 | 67.6 |
400_26 | 660 | 56.7 | 4.6 | 38.7 | α (Al) | 56.7 | 4.6 | 38.7 | – | – | – | – | – | – |
400_27 | 660 | 38.0 | 34.0 | 28.0 | τr + ε1 + L | 50.3 | 39.8 | 9.9 | 10.6 | 25.8 | 63.6 | – | – | – |
400_28 | 660 | 23.2 | 15.3 | 61.5 | ε1 +L | 9.96 | 23.12 | 66.92 | 32.3 | 8.1 | 59.6 | – | – | – |
400_29 | 660 | 6.1 | 34.3 | 59.6 | γ + ε1 | 6.6 | 35.7 | 57.7 | 4.7 | 26.3 | 69.0 | – | – | – |
400_30 | 660 | 21.7 | 67.9 | 10.4 | γ′ + α (Cu) | 25.7 | 64.7 | 9.6 | 12.3 | 74.2 | 13.5 | – | – | – |
400_31 | 660 | 18.0 | 59.8 | 22.2 | γ′ + β | 20.3 | 59.6 | 20.1 | 10.7 | 59.1 | 30.2 | – | – | – |
400_32 | 660 | 14.4 | 52.1 | 33.5 | γ′ | 14.4 | 52.1 | 33.5 | – | – | – | |||
400_33 | 660 | 17.0 | 50.2 | 32.8 | γ + γ′ | 15.4 | 48.7 | 35.9 | 18.2 | 50.7 | 31.1 | – | – | – |
400_34 | 715 | 50.9 | 40.3 | 8.8 | τr | 50.9 | 40.3 | 8.8 | – | – | – | |||
400_35 | 715 | 74.8 | 18.8 | 6.4 | θ + α (Al) | 65.7 | 32.5 | 1.8 | 85.2 | 2.1 | 12.7 | – | – | – |
400_36 | 715 | 69.2 | 19.2 | 11.6 | θ + α (Al) | 65.7 | 31.7 | 2.6 | 78.8 | 3.1 | 18.1 | – | – | – |
400_37 | 715 | 26.6 | 6.3 | 67.1 | L | 26.5 | 6.3 | 67.2 | – | – | – | |||
400_38 | 715 | 18.6 | 53.7 | 27.7 | γ′ | 18.6 | 53.7 | 27.7 | – | – | – | |||
400_39 | 715 | 63.8 | 18.0 | 18.2 | θ + α (Al) | 65.8 | 31.5 | 2.7 | 60.3 | 4.1 | 35.4 | – | – | – |
400_40 | 715 | 28.8 | 37.8 | 33.4 | τi + ε1 | 40.2 | 43.5 | 16.3 | 13.3 | 31.6 | 55.1 | – | – | – |
400_41 | 715 | 59.4 | 20.9 | 19.7 | θ + τr + α (Al) | 65.8 | 31.9 | 2.3 | 53.5 | 38.7 | 7.8 | 54.0 | 4.7 | 41.3 |
400_42 | 680 | 51.1 | 25.1 | 23.8 | τr + α (Al) + L | 52.7 | 39.0 | 8.3 | 50.3 | 4.7 | 45.0 | 30.0 | 9.8 | 60.2 |
400_43 | 680 | 48.6 | 26.7 | 24.7 | τr + α (Al) + L | 51.7 | 39.9 | 8.4 | 48.7 | 4.6 | 46.7 | 30.3 | 8.5 | 61.2 |
400_44 | 680 | 34.1 | 54.8 | 11.1 | δ + ζ′+ τc | 32.8 | 60.2 | 7.0 | 38.9 | 51.5 | 9.6 | 32.0 | 50.7 | 17.3 |
400_45 | 680 | 3.5 | 8.3 | 88.2 | ε1 + L | 1.7 | 15.1 | 83.2 | 4.6 | 3.1 | 92.3 | – | – | – |
400_46 | 680 | 30.4 | 49.0 | 20.6 | τc | 30.4 | 49.0 | 20.6 | – | – | – | |||
400_47 | 680 | 45.4 | 43.6 | 11.0 | τi | 45.4 | 43.6 | 11.0 | – | – | – | |||
400_48 | 680 | 39.9 | 44.6 | 15.5 | τi | 39.8 | 44.7 | 15.5 | – | – | – | |||
400_49 | 680 | 35.0 | 46.1 | 18.9 | τi | 35.0 | 46.1 | 18.9 | – | – | – | |||
400_50 | 680 | 28.9 | 49.4 | 21.7 | τc | 28.9 | 49.4 | 21.7 | – | – | – | |||
450_1 | 500 | 15.9 | 50.9 | 33.2 | γ/γ′ | 15.9 | 50.1 | 34.0 | 16.2 | 50.5 | 33.3 | – | – | – |
500_1 | 500 | 16.0 | 49.3 | 34.7 | γ/γ′ | 15.3 | 52.2 | 32.5 | – | – | – | |||
550_1 | 840 | 32.5 | 55.2 | 12.3 | γ′ + τc | 31.9 | 59.1 | 9.0 | 32.8 | 53.0 | 14.2 | – | – | – |
550_2 | 840 | 29.5 | 55.5 | 15.0 | γ′ + τc | 29.3 | 57.5 | 13.2 | 30.3 | 52.1 | 17.6 | – | – | – |
550_3 | 840 | 21.7 | 55.4 | 22.9 | γ′ | 21.7 | 55.4 | 22.9 | – | – | – | |||
550_4 | 840 | 10.5 | 55.8 | 33.7 | β + γ′ | 8.3 | 58.5 | 33.2 | 11.7 | 54.5 | 33.8 | – | – | – |
550_5 | 840 | 36.0 | 56.1 | 7.9 | δ + τi | 35.4 | 58.6 | 6.0 | 36.3 | 53.4 | 10.3 | – | – | – |
550_6 | 840 | 31.8 | 41.0 | 27.2 | τc+ L+ε1 | 33.9 | 46.7 | 19.4 | 43.4 | 30.9 | 25.7 | 26.1 | 42.5 | 31.4 |
550_7 | 840 | 5.9 | 39.8 | 54.3 | γ | 5.9 | 39.8 | 54.3 | – | – | – | – | – | – |
550_8 | 840 | 5.4 | 52.5 | 42.1 | β + γ′ | 4.5 | 55.2 | 40.3 | 6.6 | 49.0 | 44.4 | – | – | – |
550_9 | 840 | 24.3 | 45.5 | 30.2 | ε1+γ | 24.3 | 45.5 | 30.2 | – | – | – | – | – | – |
550_10 | 840 | 4.5 | 65.3 | 30.2 | α (Cu) + β | 4.1 | 67.0 | 28.9 | 6.2 | 62.3 | 31.5 | – | – | – |
550_11 | 840 | 22.6 | 47.4 | 30.0 | τc + γ + δ | 26.6 | 50.0 | 23.4 | 19.2 | 48.6 | 32.2 | 23.9 | 45.4 | 30.7 |
550_12 | 420 | 23.7 | 69.9 | 6.4 | β + γ′ | 20.4 | 72.6 | 7.0 | 27.6 | 67.0 | 5.4 | – | – | – |
550_13 | 420 | 20.2 | 65.9 | 13.9 | β + γ′ | 25.1 | 63.5 | 11.4 | 16.2 | 67.6 | 16.2 | – | – | – |
550_14 | 420 | 10.2 | 71.3 | 18.5 | α (Cu) + β | 9.4 | 72.0 | 18.6 | 13.2 | 67.6 | 19.2 | – | – | – |
550_15 | 420 | 40.6 | 48.1 | 11.3 | τi | 40.6 | 48.1 | 11.3 | – | – | – | – | – | – |
550_16 | 420 | 35.1 | 48.4 | 16.5 | τc | 35.1 | 48.4 | 16.5 | – | – | – | – | – | – |
550_17 | 420 | 41.3 | 43.8 | 14.9 | τi + L | 40.6 | 44.4 | 15.0 | 58.7 | 29.5 | 11.8 | – | – | – |
550_18 | 420 | 27.5 | 47.1 | 25.4 | τc + ε1 | 29.6 | 49.9 | 20.5 | 26.7 | 46.4 | 26.9 | – | – | – |
550_19 | 420 | 30.3 | 34.4 | 35.3 | ε1 + L | 25.3 | 42.5 | 32.2 | 36.9 | 23.7 | 39.4 | – | – | – |
550_20 | 420 | 41.6 | 47.8 | 10.6 | τi | 41.6 | 47.8 | 10.6 | – | – | – | – | – | – |
550_21 | 560 | 56.8 | 40.3 | 2.9 | τr + θ | 49.9 | 45.4 | 4.7 | 65.2 | 34.0 | 0.8 | – | – | – |
550_22 | 560 | 46.7 | 46.1 | 7.2 | τi | 46.7 | 46.1 | 7.2 | – | – | – | – | – | – |
550_23 | 560 | 37.4 | 51.9 | 10.7 | τi | 37.4 | 51.9 | 10.7 | – | – | – | – | – | – |
550_24 | 560 | 12.4 | 46.3 | 41.3 | γ/γ′ | 12.4 | 46.3 | 41.3 | – | – | – | – | – | – |
550_25 | 560 | 9.5 | 50.1 | 40.4 | γ | 9.5 | 50.1 | 40.4 | – | – | – | – | – | – |
550_26 | 560 | 9.5 | 47.1 | 43.4 | γ | 9.4 | 47.2 | 43.4 | – | – | – | – | – | – |
550_27 | 560 | 24.7 | 73.9 | 1.4 | α (Cu) + γ′ | 18.3 | 80.3 | 1.4 | 28.9 | 69.8 | 1.3 | – | – | – |
550_28 | 560 | 53.3 | 39.2 | 7.5 | τi + L | 47.1 | 45.5 | 7.4 | 62.5 | 29.6 | 7.9 | – | – | – |
550_29 | 635 | 25.8 | 32.3 | 41.9 | ε1+ L | 21.9 | 39.2 | 38.9 | 31.9 | 19.2 | 48.9 | – | – | – |
550_30 | 635 | 25.2 | 49.4 | 25.4 | τc+ γ′ | 28.2 | 49.8 | 22.0 | 22.7 | 49.1 | 28.2 | – | – | – |
550_31 | 635 | 6.2 | 31.5 | 62.3 | ε1+ γ | 6.5 | 33.0 | 60.5 | 3.8 | 26.5 | 69.7 | – | – | – |
550_32 | 635 | 39.4 | 57.9 | 2.7 | δ + ζ′ | 37.7 | 59.7 | 2.6 | 39.8 | 57.6 | 2.6 | – | – | – |
550_33 | 635 | 16.8 | 39.6 | 43.6 | γ + δ1 | 16.6 | 41.2 | 42.2 | 17.1 | 39.2 | 43.7 | – | – | – |
550_34 | 635 | 42.6 | 54.5 | 2.9 | ζ | 42.6 | 54.5 | 2.9 | – | – | – | |||
550_35 | 635 | 16.4 | 40.3 | 43.3 | γ + δ1 | 15.2 | 42.1 | 42.7 | 16.1 | 39.1 | 44.8 | – | – | – |
550_36 | 635 | 3.8 | 30.0 | 66.2 | ε1+ γ | 4.2 | 34.9 | 60.9 | 3.9 | 30.7 | 65.4 | – | – | – |
550_37 | 635 | 11.6 | 36.1 | 52.3 | ε1+ γ | 11.3 | 36.1 | 52.6 | 12.1 | 33.5 | 54.4 | – | – | – |
550_38 | 635 | 21.3 | 45.2 | 33.5 | γ + δ + ε1 | 19.1 | 47.4 | 33.5 | 22.0 | 43.4 | 34.6 | – | – | – |
700-_1 | 570 | 40.26 | 57.87 | 1.87 | ε′ | 40.26 | 57.87 | 1.87 | – | – | – | |||
700_2 | 570 | 38.4 | 56.8 | 4.8 | γ′ + ε′ | * | * | * | 38.4 | 56.8 | 4.8 | – | – | – |
700_3 | 570 | 33.3 | 59.1 | 7.6 | γ′ + ε′ | 33.3 | 59.1 | 7.6 | * | * | * | – | – | – |
700_4 | 570 | 32.8 | 56.8 | 10.4 | γ′ | 32.8 | 56.8 | 10.4 | – | – | – | |||
700_5 | 570 | 30.4 | 56.9 | 12.7 | γ + τc | 29.7 | 59.5 | 10.8 | 30.8 | 56.3 | 12.9 | – | – | – |
700_6 | 570 | 27.9 | 57.5 | 14.6 | γ + τc | 27.7 | 57.7 | 14.6 | * | * | * | – | – | – |
700_7 | 570 | 24.4 | 55.7 | 19.9 | γ | 24.4 | 55.7 | 19.9 | – | – | – | |||
700_8 | 570 | 17.5 | 54.7 | 27.8 | γ | 17.5 | 54.7 | 27.8 | – | – | – | – | – | – |
700_9 | 450 | 35.5 | 58.4 | 6.1 | γ′ + ε′ | 34.4 | 59.9 | 5.7 | 35.6 | 58.3 | 6.1 | – | – | – |
700_10 | 450 | 33.6 | 56.1 | 10.3 | γ′ + τc | 32.0 | 58.6 | 9.4 | 33.6 | 55.7 | 10.7 | – | – | – |
700_11 | 450 | 13.4 | 73.4 | 13.2 | α (Cu) + β | 12.9 | 73.6 | 13.5 | 16.0 | 70.5 | 13.5 | – | – | – |
700_12 | 450 | 12.5 | 57.1 | 30.4 | β + γ | 12.5 | 57.6 | 29.9 | 14.5 | 54.8 | 30.7 | – | – | – |
700_13 | 450 | 40.7 | 44.8 | 14.5 | τc+ L | 34.3 | 51.5 | 14.2 | 45.3 | 39.7 | 15.0 | – | – | – |
700_14 | 480 | 33.7 | 43.4 | 22.9 | τc+ L | 28.9 | 49.0 | 22.1 | 40.9 | 36.5 | 22.6 | – | – | – |
700_15 | 480 | 24.8 | 43.0 | 32.2 | ε1+ L | 24.6 | 42.8 | 32.6 | 33.3 | 28.7 | 38.0 | – | – | – |
700_16 | 480 | 16.3 | 35.2 | 48.5 | ε1+ L | 16.2 | 39.4 | 44.4 | 16.6 | 28.0 | 55.4 | – | – | – |
700_17 | 480 | 12.5 | 32.6 | 54.9 | ε1+ L | 13.0 | 35.6 | 51.4 | 12.6 | 22.3 | 65.1 | – | – | – |
700_18 | 480 | 8.1 | 28.2 | 63.7 | ε1+ L | 7.8 | 32.3 | 59.9 | 9.2 | 23.4 | 67.4 | – | – | – |
820_1 | 330 | 33.8 | 59.3 | 6.9 | γ′ + ε | 32.9 | 60.8 | 6.3 | 34.2 | 59.0 | 6.8 | – | – | – |
820_2 | 330 | 19.6 | 61.1 | 19.3 | γ | 19.6 | 61.1 | 19.3 | – | – | – | – | – | – |
820_3 | 330 | 36.5 | 60.3 | 3.2 | γ′ + ε′ | 35.2 | 61.7 | 3.1 | 37.2 | 59.6 | 3.2 | – | – | – |
820_4 | 330 | 28.6 | 57.9 | 13.5 | γ + L | 27.7 | 59.1 | 13.2 | 29.4 | 54.9 | 15.7 | – | – | – |
820_5 | 330 | 24.8 | 52.6 | 22.6 | γ + L | 24.3 | 53.4 | 22.3 | 25.3 | 51.6 | 23.1 | – | – | – |
820_6 | 330 | 17.8 | 70.1 | 12.1 | β | 17.8 | 70.1 | 12.1 | – | – | – | – | – | – |
820_7 | 330 | 30.0 | 61.6 | 8.4 | γ | 30.0 | 61.6 | 8.4 | – | – | – | – | – | – |
820_8 | 330 | 24.8 | 71.0 | 4.2 | β + γ | 25.0 | 70.5 | 4.5 | 28.2 | 67.9 | 3.9 | – | – | – |
820_9 | 330 | 17.9 | 64.9 | 17.2 | β | 17.9 | 64.9 | 17.2 | – | – | – | – | – | – |
820_10 | 330 | 15.2 | 76.9 | 7.9 | α (Cu) +β | 14.0 | 77.9 | 8.1 | 17.2 | 74.5 | 8.3 | – | – | – |
820_11 | 330 | 30.8 | 57.0 | 12.2 | γ + L | 30.8 | 57.6 | 11.6 | 32.2 | 54.1 | 13.7 | – | – | – |
820_12 | 330 | 9.1 | 68.6 | 22.3 | α (Cu) +β | 7.7 | 70.6 | 21.7 | 9.4 | 66.4 | 24.2 | – | – | – |
820_13 | 330 | 4.7 | 53.4 | 41.9 | β | 4.7 | 53.4 | 41.9 | – | – | – | – | – | – |
Experimental phase diagram investigation
T [°C]_No. | Nominal comp. (at.%) | Thermal effects (heating) (°C) | |||||
---|---|---|---|---|---|---|---|
Liquidus | Solidus | Transition γ ↔ γ′ | other transitions | ||||
Al | Cu | Zn | |||||
400_38 | 18.6 | 53.7 | 27.7 | 940.7 | 903.8 | 569.1 | |
550_3 | 21.7 | 55.4 | 22.9 | 952.2 | 903.6 | 622.2 | 270.2 |
700_6 | 27.9 | 57.5 | 14.6 | 955.0 | 892.0 | 727.8 | |
700_4 | 32.8 | 56.8 | 10.4 | * | * | 826.9 | 641.9 |
Results and discussion
Isothermal section at 400 °C
The τ-phase
Sample | Phase | Method | at.% Al | at.% Cu | at.% Zn |
---|---|---|---|---|---|
400_13 | τc | EDX | 32.7 | 47.8 | 19.5 |
Rietveld | 29.9 | 48.5 | 21.6 | ||
400_46 | τc | EDX | 30.4 | 49.0 | 20.6 |
Rietveld | 31.6 | 49.0 | 19.4 | ||
400_86 | τc | EDX | 28.9 | 49.5 | 21.6 |
Rietveld | 28.8 | 49.5 | 21.7 | ||
400_11 | τr | EDX | 48.4 | 41.7 | 9.9 |
Rietveld | 54.2 | 40.0 | 5.8 | ||
400_34 | τr | EDX | 50.9 | 40.3 | 8.8 |
Rietveld | 54.9 | 39.8 | 5.3 |
Space group R-3 m, Pearson symbol hR30 | ||||||
---|---|---|---|---|---|---|
a = 4.126569(18) Å, c = 25.19380(15) Å | ||||||
Site | Wyckoff Pos. | x | y | z | Occupation | Beq |
Cu1 | 3a | 1/3 | 2/3 | 1/8 | Cu: 1.00(14) | 0.878(30) |
Cu2 | 6c | 2/3 | 1/3 | 0.030544(50) | Cu: 1.00(14) | 0.878(30) |
Cu3 | 6c | 0 | 0 | 0.10673(35) | Cu: 0.153(20) | 0.878(30) |
Al1 | 6c | 1/3 | 2/3 | 0.06919(12) | Al: 0.90(11) Zn: 0.10(11) | 0.678(94) |
Al2 | 6c | 2/3 | 1/3 | 0.132822(92) | Al: 1.000(94) Zn: 0.000(94) | 0.678(94) |
Al3 | 3a | 0 | 0 | 0 | Al: 0.76(13) Zn: 0.24(13) | 0.678(94) |
Isothermal section at 550 °C
Isothermal section at 700 °C
Isothermal section at 820 °C
The γ/γ′ phase field
Conclusions
- Mutual relationships of γ + γ′ phases were studied in whole concentration and temperature range. Independent two-phase field of γ + γ′ was observed up to 400 °C. At higher temperature, the phase transition γ ↔ γ′ is proposed to be second order.
- An isopleth between the binary phases γ and γ′ was constructed
- For the ternary phase, at 400 °C we found strongly temperature-dependent one phase fields containing phases with cubic CsCl-type structure (τc) and a related rhombohedral structure type (τr), respectively, and an intermediate composition range with apparently incommensurate modulation (τi). The rhombohedral structure type (τr) was not found at 550 °C and above. At 700 °C we only found the cubic structure modification (τr)
- Isothermal sections at 400 °C, 550 °C, 700 °C and 820 °C were constructed