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Microstructure and mechanical properties of a Cu-Zr based bulk metallic glass containing atomic scale chemical heterogeneities
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2018-05-24 , DOI: 10.1016/j.msea.2018.05.082
Reza Rashidi , Mehdi Malekan , Reza Gholamipour

In this research, Tin was alloyed to the Cu47Zr47Al6 bulk metallic glass to induce chemical heterogeneities formation and study its effect on the mechanical and thermal properties. The large difference in enthalpy of mixing of Sn-Zr (−43 kJ/mol) and Sn-Cu (+7 kJ/mol) causes chemical heterogeneities. Microstructural examination showed composition fluctuations including Cu-rich and Zr-rich zones in (Cu47Zr47Al6)99 Sn1 alloy, improves ductility and fracture strength by 72.15% and 26.37%, respectively. Correlation between microstructure and mechanical properties was investigated through work hardening behavior, serration density and fractography of compression samples. Chemical heterogeneities lead to increase in shear bands, consequently enhance ductility and work hardening rate.



中文翻译:

包含原子尺度化学异质性的Cu-Zr基大块金属玻璃的微观结构和力学性能

在这项研究中,锡与Cu 47 Zr 47 Al 6块状金属玻璃形成合金,以诱导化学异质形成并研究其对机械性能和热性能的影响。Sn-Zr(-43 kJ / mol)和Sn-Cu(+7 kJ / mol)混合焓的较大差异会导致化学异质性。显微组织检查表明,在(Cu 47 Zr 47 Al 699 Sn 1中,包括富Cu和富Zr区域在内的成分波动合金,分别将延展性和断裂强度提高了72.15%和26.37%。通过加工硬化行为,锯齿密度和压缩样品的分形图研究了微观结构与力学性能之间的相关性。化学异质性导致剪切带增加,因此提高了延展性和加工硬化率。

更新日期:2018-05-24
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