朱云鹏,解品,张瑞,金培鹏,徐仕翀

• 1:青海大学青海省轻合金重点实验室青海省轻金属合金及深加工工程技术研究中心
• 2:吉林师范大学功能材料物理与化学教育部重点实验室

摘要(Abstract)：

在变形温度为250~400℃,应变速率5×10-5~0.5 s~(-1)范围内,研究了均匀化热处理态Mg_2B_2O_5/AZ63B镁基复合材料的热压缩变形行为,并利用双曲线正弦函数建立了其本构方程。结果表明:复合材料的峰值应力及其对应的应变均随温度的降低及应变速率的增加而增大;计算峰值应力与实验值的比较表明双曲正弦函数可以准确描述复合材料的本构关系;复合材料的应力指数n和激活能Q分别为5.5和221 kJ/mol,其变形机制为晶格扩散控制的位错攀移机制。热挤压试验表明:经过均匀化热处理,复合材料的最大及稳态挤压力与铸态相比分别下降了92 kN和80 kN。

关键词(KeyWords)： 镁基复合材料;热变形;均匀化热处理;本构关系

Abstract:

Keywords:

基金项目(Foundation): 青海大学中青年基金(2014-QGY-3);; 青海省科技项目(2013-G-Q013A-3,2014-Z-Y23);; 国家自然科学基金(51300175)

作者(Author): 朱云鹏,解品,张瑞,金培鹏,徐仕翀

DOI: 10.13289/j.issn.1009-6264.2016.10.009

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