Strain rate-dependent high temperature compressive deformation characteristics of ultrafine-grained pure aluminum produced by ECAP
等通道转角挤压超细晶纯铝高温压缩变形特点的应变速率依赖性
查看参考文献27篇
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文摘
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To explore the effect of strain rate e& on the high temperature deformation characteristics of ultrafine-grained materials, the deformation and damage features as well as microstructures of ECAP-treated pure Al at different temperatures T and strain rates e& were systematically studied through compression tests and microscopic observations. The increase in ? eliminates strain softening at T≤473 K, and largely enhances the yield strength and flow stress at 473-573 K. The shear deformation dominates the plastic deformation of ECAP-treated Al. Many cracks along shear bands (SBs) are formed at T≥473 K and secondary SBs basically disappear at 1×10~(-3) s~(-1); however, at 1×10~(-2) s~(-1), cracks are only observed at temperature below 473 K, and secondary SBs become clearer at T≥473 K. The microstructures of ECAP-treated Al mainly consist of sub-grains (SGs). The increase in ? inhibits the SG growth, thus leading to the increases both in yield strength and flow stress at high temperatures. |
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其他语种文摘
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为了探索应变速率对超细晶材料高温变形特点的影响,通过压缩实验以及显微观察,系统研究在不同温度和应变速率下等通道转角挤压Al的变形和损伤特点以及显微微组织。结果表明:应变速率的提高消除了等通道转角挤压Al在变形温度T≤ 473 K时表现出的应变软化现象,并且大大提高了变形温度在473~573 K范围的屈服强度和流变应力。等通道转角挤压Al的塑性变形主要由剪切变形控制。当应变速率为1×10~(-3) s~(-1)时,变形温度T ≥ 473 K时可观察到沿剪切带形成了大量裂纹,并且二次剪切带基本消失。而当应变速率为1×10~(-2) s~(-1)时,只有在变形温度低于473 K时才能观察到沿剪切带形成的裂纹,并且当压缩温度T≥ 473 K时,二次剪切带变得更加清晰。等通道转角挤压Al的显微组织主要由亚晶组成,应变速率的提高抑制了亚晶的长大,从而导致高温屈服强度和流变应力的提高。 |
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来源
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Transactions of Nonferrous Metals Society of China
,2016,26(4):966-973 【核心库】
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DOI
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10.1016/S1003-6326(16)64193-6
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关键词
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equal channel angular pressing (ECAP)
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pure Al
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strain rate
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high temperature compression
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deformation
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damage
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microstructure
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地址
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Institute of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, Shenyang, 110819
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School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870
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Institute of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Shenyang, 110819
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1003-6326 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5702929
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