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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Cu56Hf27Ti17块体金属玻璃的缺口韧性
DOI: 10.3724/SP.J.1037.2013.00139, PP. 969-975
Keywords: 铜合金,金属玻璃,断裂韧性,弹性常数
Abstract:
通过研究Cu-Hf-Ti三元合金的玻璃形成能力对合金成分的依赖性,优化出Cu56Hf27Ti17和Cu57Hf27Ti16合金,其形成金属玻璃棒材的临界直径为5mm.采用单边缺口试样测量的Cu56Hf27Ti17金属玻璃的缺口韧性KQ为(92±10)MPa·m1/2,几乎是Cu49Hf42Al9金属玻璃(KQ=(56±9)MPa·m1/2)的一倍,是目前所知韧性最高的铜基块体金属玻璃.相对于Cu49Hf42Al9金属玻璃,Cu56Hf27Ti17金属玻璃的高韧性与其高Poisson比(ν=0.361)和低剪切模量(G=38.6GPa)关联.Cu56Hf27Ti17块体金属玻璃的高韧性表现为裂纹尖端形成大塑性区,在裂纹萌生与扩展过程中,形成大尺寸剪切滑移区和脉纹花样区.Cu56Hf27Ti17和Cu49Hf42Al9块体金属玻璃在缺口韧性上的差异表明,从Cu-Zr/Hf基合金中去除Al元素有利于金属玻璃的韧化.
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