向道平,李元元,李小强

• 1:华南理工大学机械与汽车工程学院

摘要(Abstract)：

利用放电等离子烧结技术制备高密度W-7Ni-3Fe合金,研究了烧结保温时间对合金致密度、物相、显微组织以及力学性能的影响。结果表明,在1200℃烧结5~14 min后,合金均能实现充分致密化,保温时间对相对密度影响较小。合金中的W晶粒随保温时间的延长开始尺寸变化不大,烧结11 min以上才明显长大,但大多数W晶粒尺寸仍小于5μm。烧结时间超过8min,合金中新出现一种灰色的富W组织。随保温时间延长,合金的洛氏硬度下降不大,然而抗弯强度却明显上升。合金弯曲断口形貌在较短保温时间以沿晶断裂为主,粘结相的延性撕裂和W晶粒的解理断裂随烧结时间延长逐渐增多。

关键词(KeyWords)： W-7Ni-3Fe合金;放电等离子烧结;保温时间;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家“973”计划前期研究专项(2007CB616905);; 国家“863”专题课题(2007AA032112)

作者(Author): 向道平,李元元,李小强

DOI: 10.13289/j.issn.1009-6264.2010.01.013

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