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Magnesium alloys with different content of zinc (Zn) and yttrium (Y) were extruded at an extrusion ratio of 18:1 at 350 °C. The alloying elements in both Mg alloys formed a long period stacking ordered (LPSO) phase, which during the extrusion process was elongated along the extrusion direction (ED). The magnesium matrix has bimodal character composed by fine dynamically recrystallized (DRX-ed) grains and initial coarse grains elongated along ED. Compression tests with concurrent acoustic emission (AE) measurements were performed along ED at 200, 300, and 400 °C. The deformation mechanisms and the mechanical properties at 200 °C are very similar to those obtained at ambient temperatures, i.e. in the alloy with low volume fraction of the LPSO phase (<10%) twinning controls the yielding, while in the alloy with high volume fraction of the LPSO phase (around 35%) dislocation slip and kink formation are dominant. At 300 °C the reinforcing effect of the LPSO phase is reduced and at 400 °C it is not effective anymore.
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Pan H, Ren Y, Fu H, Zhao H, Wang L, Meng X, Quin G (2016) Recent developments in rare-earth free wrought magnesium alloys having high strength: a review. J Alloys Compd. 663: 146–156.
Kainer Ku (2000) Magnesium alloys and their applications. Wiley-VCH, Weinheim, Germany.
Yamasaki M, Hashimoto K, Hagihara K, Kawamura Y (2011) Effect of multimodal microstructure evolution on mechanical properties of Mg–Zn–Y extruded alloy. Acta Mater. 59: 3646–3658.
Hagihara K, Yokotani N, Umakoshi Y (2010) Plastic deformation behavior of Mg12YZn with 18R long-period stacking ordered structure. Intermetallics 18: 267–276.
Hagihara K, Sugino Y, Fukusumi Y, Umakoshi Y, NakanoT (2011) Plastic Deformation Behavior of Mg12ZnY LPSO-Phase with 14H-Typed Structure. Mater. Trans. 52: 1096–1103.
Abe E, Kawamura Y, Hayashi K, Inoue A (2002) Long-period ordered structure in a high-strength nanocrystalline Mg-1at%Zn-2at% Y alloy studied by atomic-resolution Z-contrast STEM. Acta Mater 50: 3845–3857.
Matsuda M, Ando S, Nishida M (2005) Dislocation structure in rapidly solidified Mg 97Zn 1Y 2 alloy with long period stacking order phase. Mater Trans 46: 361–364.
Bohlen J, Yi S, Letzig D, Kainer KU (2010) Effect of rare earth elements on the microstructure and texture development in magnesium–manganese alloys during extrusion. Mater. Sci. Eng. A 527: 7092–7098.
Dobroň P, Chmelík F, Yi S, Parfenenko K, Letzig D, Bohlen J (2011) Grain size effects on deformation twinning in an extruded magnesium alloy tested in compression. Scripta Mater. 65: 424–427.
Victoria-Hernandez J, Yi S, Letzig D, Hernandez-Silva D, Bohlen J (2013) Microstructure and texture development in hydrostatically extruded MgAlZn alloys during tensile testing at intermediate temperatures. Acta Mater. 61: 2179–2193.
Garces G, Perez P, Cabeza S, Lin HK, Kim S, Gan W, Adeva P (2015) Reverse tension/compression asymmetry of a Mg-Y-Zn alloys containing LPSO phases. Mater. Sci. Eng. A 647: 287–293.
Shao XH, Yang ZQ, Ma XL (2010) Strengthening and toughening mechanisms in Mg–Zn–Y alloy with a long period stacking ordered structure. Acta Mater. 58: 4760–4771.
Itoi T, Seimiya T, Kawamura Y, Hirohashi M (2004) Long period stacking structures observed in Mg 97Zn 1Y 2 alloy. Scr. Mater. 51: 107–111.
Garces G, Morris DG, Munoz-Morris MA, Perez P, Tolnai D, Mendis C, Stark A, Lim HK, Kim S, Shell N, Adeva P (2015) Plasticity analysis by synchrotron radiation in a Mg 97Y 2Zn 1 alloy with bimodal grain structure and containing LPSO phase. Acta Mater. 94: 78–86.
Hagihara K, Kinoshita A, Sugino Y, Yamasaki M, Kawamura Y, Yasuda HY, Umakoshi Y (2010) Effect of long-period stacking ordered phase on mechanical properties of Mg 97Zn 1Y 2 extruded alloy. Acta Mater. 58: 6282–6293.
Zhou X, Liu C, Gao Y, Jiang S, Han X, Chen Z (2017) Evolution of LPSO phases and their effect on dynamic recrystallization in a Mg-Gd-Y-Yn-Yr alloy. Metall. Mater. Trans. A 48: 3060–3072.
Liu H, Ju J, Yang X, Yan J, Song D, Jiang J, Ma A (2017) A two-step dynamic recrystallization by LPSO phases and its impact on mechanical property of severe plastic deformation processed Mg 97Y 2Zn 1 alloy. J. Alloys Compd. 704: 509-517.
Lv BJ, Peng J, Peng Y, Tang AT, Pan FS (2013) The effect of LPSO phase on hot deformation behavior and hot workability of Mg-2.0Zn-0.3Zr-5.8Y alloy. Mater. Sci. Eng. A 579: 209–216.
Onorbe E, Garcés G, Perez P, Adeva P (2012) Effect of the LPSO volume fraction on the microstructure and mechanical properties of Mg-Y 2x-Zn x alloys. J Mater Sci 47: 1085–1093.
Horváth K, Drozdenko D, Daniš S, Garcés G, Máthis K, Kim S, Dobroň P (2017) Characterization of Microstructure and Mechanical Properties of Mg-Y-Zn Alloys with Respect to Different Content of LPSO Phase. Adv. Eng. Mater. DOI: https://doi.org/10.1002/adem.201700396.
Horváth K, Drozdenko D, Garcés G, Máthis K, Dobroň P (2017) Effect of Extrusion Ratio on Microstructure and Resulting Mechanical Properties of Mg Alloys with LPSO Phase. Magnesium Technology 2017: 29–34.
Tahreen N, Zhang DF, Pan FS, Jiang XQ, Li DY, Chen DL (2015) Hot deformation and work hardening behavior of an extruded Mg-Zn-Mn-Y alloy. J Mater Sci Technol 31: 1161–1170.
Ion SE, Humphreys FJ, White SH (1982) Dynamic recrystallization and the development of microstructure during the high temperature deformation of magnesium. Acta Metall. 30: 1909–1919.
Kocks UF, Westlake DG (1967) The importance of twinning for the ductility of CPH polycrystals. Trans. Metall. Soc. 239: 1107–1109.
Perez P, Eddahbi M, González S, Garces G, Adeva P (2011) Refinement of the microstructure during superplastic deformation of extruded Mg 94Ni 3Y 1.5CeMM 1.5 alloy. Scr. Mater. 64: 33–36.
Heiple CR, Carpenter SH (1987) Acoustic Emission Produced by Deformation of Metals and Alloys – A Review: Part I. J. Acoust. Emission 6: 177–204.
Heiple CR, Carpenter SH (1987) Acoustic Emission Produced by Deformation of Metals and Alloys – A Review: Part II. J. Acoust. Emission 6: 215–237.
Drozdenko D, Bohlen J, Chmelík F, Lukáč P, Dobroň P (2016) Acoustic emission study on the activity of slip and twin mechanisms during compression testing of magnesium single crystals. Mater. Sci. Eng. A 650: 20–27.
- Acoustic Emission Study of High Temperature Deformation of Mg–Zn–Y Alloys with LPSO Phase
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