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Effect on microstructure and plastic deformation behavior of a Zr-based amorphous alloy by cooling rate control
Journal of Materials Science & Technology ( IF 10.9 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.jmst.2020.12.013
Feilong Wang , Dawei Yin , Jingwang Lv , Shan Zhang , Mingzhen Ma , Xinyu Zhang , Riping Liu

In this study, Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloys samples with the same diameter (8 mm) were prepared by using self-designed molds (viz. refractory steel, pure graphite, and copper molds) with different cooling capacities. Moreover, by eliminating the size effect, the effect of the cooling rate on the microstructure and compression deformation behavior of Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloys was investigated. Differentiation of the cooling curves revealed that the instantaneous cooling rates of the alloy melt at the glass transition temperature (Tg) are 45, 52, and 64 K·s―1 for refractory steel, pure graphite, and copper molds, respectively. X-ray diffraction, differential scanning calorimetry, and high-resolution transmission electron microscopy analysis revealed that with the decrease in the cooling rate, trace icosahedral-like atomic clusters and nanocrystals appear in local areas of the amorphous alloy and that the amount of free volume decreases with the increase in the amount of icosahedra-like atomic clusters and nanocrystals. Compression test results revealed that the elastic strain, yield strength, and compressive strength of the amorphous alloy marginally change with the decrease in the cooling rate, while the plastic strain gradually increases. By fitting, the effective size of the vein-like pattern was linearly related to the enthalpy released during structural relaxation and plastic strain, indicating that at a low cooling rate, the trace nanocrystals in the amorphous alloy could not effectively improve its plasticity and that the amount of free volume mainly affects its plasticity.



中文翻译:

冷却速度控制对Zr基非晶合金组织和塑性变形行为的影响

在这项研究中,使用具有不同冷却能力的自行设计的模具(即耐火钢,纯石墨和铜模具)制备了具有相同直径(8毫米)的Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5非晶态合金样品。 。此外,通过消除尺寸效应,研究了冷却速率对Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5非晶态合金的组织和压缩变形行为的影响。冷却曲线的差异表明,合金在玻璃化转变温度(Tg)是45、52和64 K·s ―1分别用于耐火钢,纯石墨和铜模具。X射线衍射,差示扫描量热法和高分辨率透射电子显微镜分析表明,随着冷却速率的降低,非晶态合金的局部区域会出现痕量的二十面体状原子团簇和纳米晶体,并且自由体积随着二十面体状原子团簇和纳米晶体数量的增加而降低。压缩试验结果表明,非晶态合金的弹性应变,屈服强度和抗压强度随冷却速率的降低而略有变化,而塑性应变则逐渐增大。通过拟合,静脉状图案的有效尺寸与结构松弛和塑性应变期间释放的焓呈线性关系,

更新日期:2021-01-22
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