Ta-particulate reinforced Zr-based bulk metallic glass matrix composite with tensile plasticity

doi:10.1016/j.scriptamat.2009.11.018

Scripta Materialia

Volume 62, Issue 5, March 2010, Pages 278-281

https://doi.org/10.1016/j.scriptamat.2009.11.018 Get rights and content

Ta-particulate reinforced Zr–Ni–Cu–Al–Ta bulk metallic glass matrix composite exhibits good mechanical properties of ∼23% plasticity in compression and 1.8% plasticity in tension without any sacrifice of strength. In situ SEM observations of tension tests combined with finite element simulation reveals that plastic deformation of Ta particles creates shear stress concentration on the interface and tunes shear stress distribution, which initiates and arrests shear bands, leading to the formation of multiple shear bands. This contributes to the enhanced plasticity of the present composite.

References (31)

C.A. Schuh et al.
Acta Mater.
(2007)
Z.W. Zhu et al.
Scripta Mater.
(2006)
G. He et al.
Acta Mater.
(2003)
R.T. Ott et al.
Acta Mater.
(2005)
R.D. Conner et al.
Acta Mater.
(1998)
W. Dong et al.
J. Alloys Comp.
(2006)
J.C. Lee et al.
Acta Mater.
(2005)
Z. Bian et al.
Acta Mater.
(2005)
Z.F. Zhang et al.
Acta Mater.
(2003)
C.E. Packard et al.
Acta Mater.
(2007)

Y. Zhang et al.

Acta Mater.

(2005)

W.L. Johnson

MRS Bull.

(1999)

A.R. Yavari et al.

MRS Bull.

(2007)

C. Fan et al.

Phys. Rev. B

(2000)

C. Fan et al.

Appl. Phys. Lett.

(2002)

Cited by (116)

Size-effects in tensile fracture of rejuvenated and annealed metallic glass
2024, Scripta Materialia
Hundreds of Pt-based metallic glass samples with diameters ranging from sub-100 nm to 100 µm are subjected to cryogenic rejuvenation and annealing above glass transition temperature before tensile loading at room temperature. Shear-localized failure with no ductility is observed in large samples whereas the smaller diameter specimens show ductile necking irrespective of the structural state of metallic glass. With decreasing sample diameter, the fracture surface changes from vein pattern to featureless in the shear-localized samples and the ductility increases in the necked samples. Despite similar size-dependent trends, the changes in deformation mode and fracture morphology occur at different diameters in as-cast, rejuvenated, and annealed samples. The critical diameters for transitions from shear localization to necking and from vein pattern to smooth fracture surface shift to larger values in cryogenically rejuvenated samples whereas annealing has the opposite effect. Rejuvenation promotes homogeneous-like flow and suppresses catastrophic tensile failure in nanoscale metallic glasses.
Determination of material properties of bulk metallic glass using nanoindentation and artificial neural network
2022, Intermetallics
Citation Excerpt :
Bulk metallic glass (BMG) has the advantage of freely changing chemical composition in a molten state and mechanical properties such as high yield strength, elasticity, and corrosion resistance [1,2].
An artificial neural network (ANN) model is combined with finite element (FE) nanoindentation to evaluate free volume model (FVM) parameters for bulk metallic glass (BMG). FVM is numerically implemented with the user material subroutine (UMAT). A material database is generated based on FE analysis, in which indentation parameters are obtained from FVM parameters. An ANN is generated in order to correlate FVM and indentation parameters and trained/tested from the generated database after the application of removal of multicollinearity, sampling, and normalization for computational efficiency. The fully trained ANN inversely evaluates the FVM parameters from the indentation parameters. The ANN approach is experimentally validated by sphero-conical/Berkovich indentation load-depth curves of Zr₅₅Cu₃₀Ag₁₅ and Zr₆₅Cu₁₅Al₁₀Ni₁₀.
Enhancing strength-ductility synergy in an ex situ Zr-based metallic glass composite via nanocrystal formation within high-entropy alloy particles
2021, Materials and Design
In this work, we prepared equiatomic AlCoCrFeNi high-entropy alloy (HEA)-particle-toughened, Zr-based metallic glass composites by spark plasma sintering. By adding HEA particles as the second phase, the strength and plasticity of the Zr-based metallic glass composites improved concomitantly. After fracture, high-density dislocations and nanocrystals were formed in the HEA particles due to local severe plastic deformation, which consumed massive strain energy to enable the resistance to crack formation. Substantial lattice distortion imparted a remarkable work-hardening capacity to the HEAs and enhanced crack-tip dislocation trapping, and thus led to an extreme refinement of the grain size. Finite-element analyses indicated that the strain hardening behavior of HEA particles reduced the magnitude of strain localization, promoted generation of multiple shear bands, and stabilized shear band propagation. We attribute the enhanced strength-ductility synergy in the current composites to high-density dislocations and nanocrystal formation in the HEA particles, and stable propagation of multiple shear bands.
Large tensile plasticity in Zr-based metallic glass/stainless steel interpenetrating-phase composites prepared by high pressure die casting
2021, Composites Part B: Engineering
The ambient-temperature brittleness of bulk metallic glasses (BMGs) is a long-standing problem in materials engineering. Herein, we report a route to overcome this Achilles’ heel of BMGs via high-pressure die casting (HPDC) at a high filling rate and pressure to create bi-continuous interpenetrating-phase composites. Our results show that large tensile plasticity of 5.1% can be achieved in the Zr-based BMG/stainless steel interpenetrating-phase composite prepared by HPDC, which is superior to most of as-reported ex-situ secondary phase reinforced BMG composites. The excellent mechanical properties of the BMG composite mainly originate from excellent metallurgical bonding between matrix and reinforcement as well as high efficiency suppression of shear band propagation by three-dimensional metal skeleton. Our findings provide a promising approach for developing cost-effective BMG composites suitable for industrial applications.
Significant plasticity and atomic-scale deformation mechanism of high glass-forming Zr-Cu-Ni-Ti-Al bulk glassy alloys
2021, Journal of Non-Crystalline Solids
The authors report a series of monolithic Zr_(65.4-_x₎Cu₍₁₂₊_x₎Ni_9.6Ti₆Al₇ (x = 0, 3, 6, 9 at.%) bulk glassy alloys with significant room-temperature plasticity and high glass-forming ability (GFA). Upon substitution of Cu for Zr, the GFA of glassy alloys is gradually increased, and the alloy possesses a critical casting size up to 10 mm when x=9. On the contrary, the plasticity is evidently increased with decreasing of Cu content in the glassy alloys, and the alloy exhibits the best plastic strain of 29.6% when x=0. Theoretical calculations indicate that the small differences in atomic sizes and atomic affinity among constituent elements should be necessary before pronounced plastic deformation can occur.
Oxygen addition for improving the strength and plasticity of TiZr-based amorphous alloy composites
2021, Journal of Materials Science and Technology
The addition of a small amount of oxygen improves the mechanical properties, especially plasticity, of Ti_45.7Zr₃₃Ni₃Cu_5.8Be_12.5 amorphous alloy composites (AACs) at room temperature (298 K). Compared to the plasticity of AACs without added O (5%), the plasticity of the composites with 0.73 at.% O (nominal composition) was much higher (11 %). Even at O content higher than 0.73 at.%, the AACs exhibited good plasticity. The highest plasticity of ∼12.3 % was observed with 2.87 at.% O. Two distinct mechanisms are proposed to explain the enhanced plasticity of the AACs. At low O content, although deformation-induced phase transformation was suppressed, a substantial amount of α’’ martensite was formed. The microstructural features of α’’ martensite, such as thinner laths and homogeneous distribution, induced the formation of multiple shear bands in the amorphous matrix. At high O content, deformation-induced phase transformation was seriously suppressed. A dispersed nano ω phase was formed during rapid solidification in AACs with O content higher than 1.45 at.%. This resulted in a weakening in the anisotropy of β dendrites and led to their homogenous deformation. Furthermore, multiple shear bands were formed in the amorphous matrix. Apart from plasticity, the strength of the AACs also increased with an increase in the O content. This phenomenon was explained in terms of three mechanisms, viz. the solid-solution-strengthening effect of O, fine-grain strengthening of β dendrites, and secondary phase strengthening by the nano ω phase.

View all citing articles on Scopus

View full text

Ta-particulate reinforced Zr-based bulk metallic glass matrix composite with tensile plasticity

Acta Mater.

Scripta Mater.

Acta Mater.

Acta Mater.

Acta Mater.

J. Alloys Comp.

Acta Mater.

Acta Mater.

Acta Mater.

Acta Mater.

Acta Mater.

MRS Bull.

MRS Bull.

Phys. Rev. B

Appl. Phys. Lett.