W对Mo-Si-B合金微观组织和力学性能的影响
Effect of W addition on microstructure and mechanical properties of Mo-Si-B alloy
徐健建 1颜建辉 1汪异 1刘龙飞 1王跃明1
作者信息
- 1. 湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湖南湘潭411201
- 折叠
摘要
采用放电等离子烧结技术(SPS)在不同温度下制备Mo-12Si-8.5B和(Mo0.9,W0.1)-12Si-8.5B多相合金材料,研究了合金的微观组织和力学性能.结果表明,两种不同成分合金的组成相中都含有α-Mo、Mo3Si和Mo5SiB2相,在(Mo0.9,W0.1)-12Si-8.5B合金中还存在单质W以及含W的固溶体.随烧结温度提高,两种合金的致密度、硬度和抗弯强度都有所增加.在1600 ～1700℃烧结工艺条件下,少量W减少了Mo-12Si-8.5B合金中显微裂纹的数量和尺寸.W加入略降低了Mo-12Si-8.5B合金的硬度,但明显提高了Mo-12Si-8.5B合金的抗弯强度.1700℃烧结制备的(Mo0.9,W0.1)-12Si-8.5B合金的抗弯强度可达441MPa,比Mo-12Si-8.5B提高了18％.
Abstract
Mo-12Si-8.5B and (Mo0.9,W0.1)-12Si-8.5B alloys were prepared by spark plasma sintering under different temperatures.Microstructure and mechanical properties of the alloys were investigated.The results show that the microstructure of Mo-12Si-8.5B alloy consists of α-Mo,Mo3Si and Mo5SiB2 phases,and the (Mo0.9,W0.1)-12Si-8.5B alloy is composed of α-M o,Mo3Si,Mo5SiB2,W and solid solution.The relative density,hardness and flexure strength of the two alloys increase with the increasing sintering temperature.Under the sintering temperature from 1600 ℃ to1700 ℃,the amount and size of micro-cracks of the Mo-12Si-8.5B alloy is reduced by the addition of W element.The flexure strength of the alloy increases,and the hardness of the Mo-12Si-8.5B alloy decreases with the addition of W element.The flexure strength of the (Mo0.9,W0.1)-12Si-8.5B alloy sintered at 1700 ℃ reaches 441 MPa,increasing by 18％ compared with the Mo-12Si-8.5B alloy.
关键词
Mo-Si-B合金/钨/等离子烧结/微观组织/力学性能Key words
Mo-Si-B alloy/W/spark plasma sintering/microstructure/mechanical property引用本文复制引用
基金项目
国家自然科学基金资助项目(51475161)
湖南省研究生科研创新项目(CX2015B485)
出版年
2015
NETL
NSTL
维普
万方数据