Microstructure and mechanical properties of a partially crystallized La-based bulk metallic glass

Basu, Joysurya; Nagabhushana, Nagendra; Li, Y.; Ramamurty, Upadrasta

doi:10.1080/0141861861031000104163

Cited by 82 publications

(52 citation statements)

References 27 publications

(3 reference statements)

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“…This observation is similar to Inoue et al [17] where they have reported a 37% increase in hardness due to nanocrystalline dispersoids in an amorphous Zr-Al-Ni-Cu-Ag alloy. Basu et al [18] have also reported that the hardness increases linearly with increasing crystallinity. They have also mentioned the abrupt increase in the elastic modulus when the crystalline volume fraction is about 40 vol.% with an only minor variation on either side of this range.…”

Section: Mechanical Properties and Gradient Microstructuresmentioning

confidence: 85%

Synthesis of bulk metallic glass composites using high oxygen containing Zr sponge

et al. 2007

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The effect of large concentration of oxygen on the microstructural development of Zr-Cu-Al-Ni bulk metallic glass (BMG) alloys, prepared from commercially available Zr sponge, has been studied. Apart from promoting crystallization, increased concentration of oxygen (~8000 ppm) spawns additional phases. In particular, we report the appearance of a-Zr, dendritic Zr 2 Cu phase and the Zr 2 Ni type cubic phases. Addition of oxygen scavenger like Yttrium only partially solves the problem. Phase evolution was also found to be sensitive to the cooling rate and hence to the thickness of the cast sample. Thus it is possible to produce a gradient microstructure with predominantly amorphous phase at the outer layer.

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Section: Mechanical Properties and Gradient Microstructuresmentioning

confidence: 85%

Synthesis of bulk metallic glass composites using high oxygen containing Zr sponge

et al. 2007

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“…6a and b). Once the percolation threshold is achieved it is known that the crystalline phases of the material loses its ductility causing an abrupt change in the mechanical properties of the metallic glass [50]. As the critical crystallinity is reached, the viscosity and elastic modulus of the alloys increases suddenly, while the fracture stress, yield strength and ultimate strength are reduced [50,51].…”

Section: Accepted Manuscript 11mentioning

confidence: 99%

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

et al. 2017

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The antimicrobial and wear behaviour of metallic glass composites corresponding to the Cu 50+x (Zr 44 Al 6 ) 50-x system with x=(0, 3 and 6) has been studied. The three compositions consist of crystalline phases embedded in an amorphous matrix and they exhibit crystallinity increase with increasing Cu content, i.e., decrease of the glass-forming ability. The wear resistance also increases with the addition of Cu as indirectly assessed from H/E r and H

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“…However, this process severely embrittles the alloy and hence is not viable. [6][7][8][9] Ex situ reinforcements have also been tried, but problems with porosity and glass/particle interfaces typically prevent significant improvement over the monolithic glass. 10 Yet another approach is to allow for crystalline dendrite formation in situ during cooling.…”

Section: Introductionmentioning

confidence: 99%

Near-threshold fatigue crack growth in bulk metallic glass composites

et al. 2009

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A major drawback in using bulk metallic glasses (BMGs) as structural materials is their extremely poor fatigue performance. One way to alleviate this problem is through the composite route, in which second phases are introduced into the glass to arrest crack growth. In this paper, the fatigue crack growth behavior of in situ reinforced BMGs with crystalline dendrites, which are tailored to impart significant ductility and toughness to the BMG, was investigated. Three composites, all with equal volume fraction of dendrite phases, were examined to assess the influence of chemical composition on the near-threshold fatigue crack growth characteristics. While the ductility is enhanced at the cost of yield strength vis-à-vis that of the fully amorphous BMG, the threshold stress intensity factor range for fatigue crack initiation in composites was found to be enhanced by more than 100%. Crack blunting and trapping by the dendritic phases and constraining of the shear bands within the interdendritic regions are the micromechanisms responsible for this enhanced fatigue crack growth resistance.

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Microstructure and mechanical properties of a partially crystallized La-based bulk metallic glass

Cited by 82 publications

References 27 publications

Synthesis of bulk metallic glass composites using high oxygen containing Zr sponge

Synthesis of bulk metallic glass composites using high oxygen containing Zr sponge

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

Near-threshold fatigue crack growth in bulk metallic glass composites

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