结构迟豫对Zr基大块非晶敏感因子的影响

稀有金属材料与工程, 2008, 37(5): 844-847.

结构迟豫对Zr基大块非晶敏感因子的影响

喻更生 ^1, , 罗联 ^2, , 翟甲友 ^3, , 林建国 ^4,

1.湘潭大学,低维材料与应用教育部重点实验室,湖南,湘潭,411105

2.湘潭大学,低维材料与应用教育部重点实验室,湖南,湘潭,411105

3.湘潭大学,低维材料与应用教育部重点实验室,湖南,湘潭,411105

4.湘潭大学,低维材料与应用教育部重点实验室,湖南,湘潭,411105

基金项目: 湖南省教育厅科研项目(04C643) 湖南省自然科学基金(05JJ30110) 低维材料与应用教育部重点实验室开发课题(KF0507)

关键词：大块非晶 , 剪切带 , 压力敏感因子

Effect of Relaxation on Pressure Sensitivity Index in a Zr-Based Metallic Glass

采用Rockwell压痕测试和SEM、DSC技术研究了铸态和退火Zr41.2Ti13.8Cu12.5Ni10Be22.5大块非晶的剪切带和焓变特征.样品在玻璃转变温度以下等温退火,DSC放热峰随着退火温度的增加不断减少,这表明自由体积不断减少.对压痕周围剪切带形态的观察表明,退火样品中被激活的剪切带减少,剪切带之间的夹角2θ不断变化,铸态大约为88°,经过633K保温1h减小为79°.由Mohr-Coulomb准则可知,通过测量2θ可以确定压力敏感因子,随着退火温度的升高,原子间相互摩擦的作用加剧,导致压力敏感因子增加.

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材料期刊网

结构迟豫对Zr基大块非晶敏感因子的影响

Effect of Relaxation on Pressure Sensitivity Index in a Zr-Based Metallic Glass

参考文献