王雷,杜蒙,谭昊,奚运涛,钟玉洁,王世清

• 1:西安石油大学材料科学与工程学院

摘要(Abstract)：

通过分离式霍普金森杆技术研究温度与应变速率对不同道次等径通道挤压2A12铝合金单轴压缩性能的影响,及不同晶粒尺寸下的应变速率敏感性与温度敏感性。结果表明:2A12铝合金的流动应力随着温度的升高下降,随应变速率的上升而提高;在较低温度或较高应变速率的条件下,材料表现出更为明显的应变硬化效果;随着晶粒尺寸的减小,合金应变速率敏感性上升,应变硬化能力急剧降低;细晶铝合金的温度敏感性高于粗晶铝合金;利用Johnson-Cook及Cowper-Symonds本构模型对真实应力应变曲线进行了拟合,所得结果吻合程度较好。

关键词(KeyWords)： 铝合金;ECAP;应变速率敏感性;应变硬化率;本构模型

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51505379,51701156);; 陕西省教育厅基金(16JK1615);; 西安石油大学《材料科学与工程》省级优势学科资助

作者(Author): 王雷,杜蒙,谭昊,奚运涛,钟玉洁,王世清

DOI: 10.13289/j.issn.1009-6264.2017-0560

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