周爱国,张建新

• 1:河南理工大学材料科学与工程学院
• 2:德雷克塞尔大学材料科学与工程系

摘要(Abstract)：

利用液压试验机对金属钛、镁和钴进行循环加载-卸载压缩试验,利用引伸计测量应变,获得样品的应力-应变曲线。钛、镁和钴因为六方密堆积晶体结构,具有塑性各向异性,导致一定的非线性弹性。这些非线性弹性在循环加载应力-应变曲线中表现为滞后环。研究表明,适当的预变形可以增大这些材料的非线性弹性。粗晶样品一般比细晶样品具有较大的非线性弹性。一种源于三元碳化物Ti3SiC2的初始弯折带(Incipient kink bands)理论可以解释这些材料的非线性弹性以及与非线性弹性相联系的微屈服、阻尼减震。一种经典滞后模型Preisach-Mayergoyz模型,可以用来计算这些材料的非线性变形量。

关键词(KeyWords)： 钛;镁;非线性弹性;弯折带;P-M模型

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金理论物理专款(10947105);; 河南省教育厅自然科学研究计划(2010B430016)

作者(Author): 周爱国,张建新

DOI: 10.13289/j.issn.1009-6264.2010.08.010

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