热压时间对Laves相Cr2Nb合金组织与性能的影响Effect of hot pressing time on microstructure and properties of laves phase Cr2Nb alloy
肖璇,鲁世强,胡平,黄铭刚,聂小武
摘要(Abstract)：
采用机械合金化+热压工艺路线制备化学配比成分的单相Laves相Cr2Nb合金。研究了Cr、Nb元素粉经20h球磨后在1300℃不同时间热压所获得的Laves相Cr2Nb合金的组织性能。结果表明,采用机械合金化+热压工艺可以制备出高致密度的组织细小均匀的Laves相Cr2Nb合金,随着热压时间的延长,合金的致密度、晶粒尺寸和维氏硬度逐渐增大而断裂韧度逐渐减小。1300℃×30min的热压试样的平均晶粒尺寸达到亚微米级,致密度达到98.7%,断裂韧度达到5.07MPa.m1/2,与熔铸法制备的Laves相Cr2Nb相比,室温断裂韧性提高,实现了细晶组织对Laves相Cr2Nb合金的增韧效果。
关键词(KeyWords)： 机械合金化;热压;Laves相Cr2Nb;增韧;组织与性能
基金项目(Foundation): 国家自然科学基金(50474009);; 航空科学基金(05G56003);; 江西省自然科学基金(0350045)
作者(Author): 肖璇,鲁世强,胡平,黄铭刚,聂小武
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