Role of heterogeneity on deformation behavior of bulk metallic glasses

Pi, D.H.; Lee, J.K.; Lee, M.H.; Sangbong, Yi; Eckert, J.; Kim, K.B.

doi:10.1016/j.jallcom.2009.07.082

Cited by 14 publications

(2 citation statements)

References 25 publications

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“…It should be noted that the small effective dendrite size is equivalent to the high degree of microstructural heterogeneity, which enhances the multiple shear banding and plasticity. [40] However, the T1 composite which has the smallest size of effective dendrites has more highly deformed bands compared to the T3 composite, as indicated by dotted red circles in Figure 18(a). There are two reasons for this discrepancy: the first reason is a difference in dendrite orientations, and the second is a difference in distance between the dendrites.…”

Section: Discussionmentioning

confidence: 98%

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

Jeon

Lee

Kim

et al. 2014

Metall Mater Trans A

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Five composite sheets having different thicknesses were fabricated by varying cooling rates after a vacuum arc melting of a Ti-based amorphous matrix composite fabricated by adding alloying elements of Ti, Zr, V, Ni, Al, and Be into a Ti-6Al-4V alloy. These composite sheets contained 72 to 75 vol. pct of dendrites sized by 9 to 27 lm, and showed excellent tensile properties of yield strength of 1.3 GPa and elongation up to 6.5 pct. According to the observation of tensile deformation behavior of the 3-mm-thick composite sheet, many deformation bands were formed inside dendrites in several directions, and deformation bands met crossly each other to form widely deformed areas. Since the wide and homogeneous deformation in this sheet beneficially worked for the tensile strength and elongation simultaneously, the optimum effective dendrite size (12.1 lm) and sheet thickness (3 mm) were determined for the Ti-based amorphous matrix composite. The finite element method (FEM) analysis based on real microstructures was also conducted to theoretically explain the enhanced elongation in terms of effective dendrite size. The shape and location of deformation bands estimated from the FEM simulations were well matched with the experimental observations.

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Section: Discussionmentioning

confidence: 98%

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

Jeon

Lee

Kim

et al. 2014

Metall Mater Trans A

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show abstract

“…Strongly localized shear deformation at room temperature limits the practical application of BMGs [9,10] since any shear event may trigger a critical size crack initiation [11,12] and rapid fracture of the sample. On the other hand, the samples of recently developed BMGs, such as Pd-Ni-Si-P [13], Ti-Zr-Cu-Ni-Sn [14] and Zr-CuFe-Al [15] system alloys, exhibit significant room temperature compressive plasticity of several percents and high fracture strength in the glassy state. At the same time, the exact mechanism of shear band propagation is still a debatable question [16,17].…”

Section: Introductionmentioning

confidence: 99%