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OALib Journal期刊
ISSN: 2333-9721
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层错能对纳米晶Cu-Al合金微观结构、拉伸及疲劳性能的影响*
DOI: DOI:10.3724/SP.J.1037.2013.00591, PP. 191-201
Keywords: 纳米晶材料,层错能,微观结构,拉伸性能,疲劳性能
Abstract:
总结了层错能对Cu-Al纳米晶合金微观结构、拉伸性能和疲劳行为的影响.研究表明随着层错能的降低,材料微观结构的演化逐步从位错分割机制主导转变为孪晶碎化机制主导,导致其平均晶粒尺寸逐步减小,而其均匀微观结构的形成经历先难后易的转变.同时,发现Cu-Al纳米晶合金的强度随层错能的降低得到明显改善,其均匀延伸率存在一最优值,使其均匀延伸率最佳.对不同晶粒尺寸的样品进行力学实验证实,随层错能降低,其强塑性匹配得到明显提升.在循环变形过程中,随层错能降低,晶粒长大导致的微观组织不稳定性和高度应变局部化的剪切带均有明显改善.材料的疲劳损伤微观机制随之从晶界迁移主导的晶粒长大逐步转变为其它晶界行为,如原子重组、晶界滑动和转动等.纳米材料的综合疲劳性能(低周和高周疲劳)随层错能的降低呈现同步提高的趋势.
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