On the microstructure–tensile property correlations in bulk metallic glass matrix composites with crystalline dendrites

Narayan, Ranjani; Singh, Parjit S.; Hofmann, Douglas C.; Hutchinson, Nicholas H.; Flores, Katharine M.; Ramamurty, Upadrasta

doi:10.1016/j.actamat.2012.06.032

Cited by 130 publications

(49 citation statements)

References 22 publications

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“…3b. It is found that the SHR values are much higher at the initial plastic stage and decay promptly with the plastic strain, which is markedly less than the reported Zr-/Ti-based MGMCs prepared by four different processes [9]. Figure 3c presents the engineering stress-strain curves upon dynamic compression with varying strain rates in the range of 1400-2800 s -1 .…”

Section: Methodsmentioning

confidence: 78%

“…However, almost all the BMGs fail with a catastrophic brittleness upon loading at room temperature due to uninhibited shear-band propagation [3]. To alleviate this fatal problem, the crystalline phases are intentionally introduced into the glass matrix to obtain in situ dendrite-reinforced metallic glass matrix composite (MGMC) [4][5][6][7][8][9], which combine high strength of the glass matrix and large plasticity of dendrites. The ductile secondary phases precipitated during solidification can effectively homogenize the deformation and facilitate the multiplication of shear bands, thus resulting in improved plasticity [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of strain rates on deformation behaviors of an in situ Ti-based metallic glass matrix composite

et al. 2016

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Quasi-static and dynamic deformation behaviors of an in situ dendrite-reinforced metallic glass matrix composite: Ti 56 Zr 18 V 10 Cu 4 Be 12 were investigated. Upon quasi-static compression, the composite exhibits distinguished work hardening, accompanied by the ultimate strength of 1290 MPa and the plasticity of 20 %. The improved plasticity is attributed to the multiplication of shear bands within the glass matrix and pileups of dislocations within the dendrites. Upon dynamic compression, the stable plastic flow prevails and the yielding stress increases with the strain rate. The macroscopic plasticity decreases considerably, since the shear bands cannot be effectively hindered by dendrites with deteriorated toughness. The dendrite-dominated mechanism results in the positive strain-rate sensitivity, and the Cowper-Symonds model is employed to depict the strain-rate dependency of yielding strength.

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Section: Methodsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Effect of strain rates on deformation behaviors of an in situ Ti-based metallic glass matrix composite

et al. 2016

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“…As such, manufacturing strategies were developed to form BMGMC parts from the semi-solid temperature region (as opposed to above the liquidus). These have included semi-solid forging, slope casting and Bridgman solidification, among others [26][27][28][29][30]. One of the major challenges associated with processing and manufacturing BMGMCs is that the Ti and Zr-based alloys are highly reactive with http crucible materials and with oxygen in the environment.…”

Section: Introductionmentioning

confidence: 99%

Infrared thermal processing history of a Ti-based bulk metallic glass matrix composite manufactured via semi-solid forging

2015

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“…[26] Flores et al [27] reported that the fracture resistance and fatigue endurance limit of Zr-Ti-Nb bulk metallic glass can be significantly improved by introducing ductile phase. Narayan et al [28] investigated the correlations between the microstructure and tensile property of Zr/Ti-based BMG composites. The effects of microstructural length scales such as dendrite size and the interdendritic spacing were discussed.…”

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis and Characterization of Zr-Based Amorphous Composite by Laser Direct Deposition

Bae

Shin

et al. 2015

Metall Mater Trans A

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Zr-based bulk metallic glasses have attracted extensive interest for structural applications due to their excellent glass-forming ability, superior mechanical properties, and unique thermal and corrosion properties. In this study, Zr 65 Al 10 Ni 10 Cu 15 amorphous composites with a large fraction of amorphous phase were in situ synthesized by laser direct deposition. X-ray diffraction confirmed the existence of both amorphous and crystalline phases. Laser parameters were optimized in order to increase the fraction of amorphous phase. The microstructure analysis by scanning electron microscopy revealed the deposited structure was composed of periodically repeated amorphous and crystalline phases. Overlapping regions with nanoparticles aggregated were crystallized by laser reheating and remelting processes during subsequent laser scans. Vickers microhardness of the amorphous region showed around 35 pct higher than that of crystalline region. Average hardness obtained by a Rockwell macrohardness tester was very close to the microhardness of the amorphous region. The compression test showed that the fracture strain of Zr 65 Al 10 Ni 10 Cu 15 amorphous composites was enhanced from less than 2 pct to as high as 5.7 pct, compared with fully amorphous metallic glass. Differential scanning calorimetry test results further revealed the amorphous structure and glass transition temperature T g was observed to be around 660 K (387°C). In 3 mol/L NaCl solution, laser direct deposited amorphous composites exhibited distinctly improved corrosion resistance, compared with fully crystallized samples.

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On the microstructure–tensile property correlations in bulk metallic glass matrix composites with crystalline dendrites

Cited by 130 publications

References 22 publications

Effect of strain rates on deformation behaviors of an in situ Ti-based metallic glass matrix composite

Effect of strain rates on deformation behaviors of an in situ Ti-based metallic glass matrix composite

Infrared thermal processing history of a Ti-based bulk metallic glass matrix composite manufactured via semi-solid forging

In Situ Synthesis and Characterization of Zr-Based Amorphous Composite by Laser Direct Deposition

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