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压制工艺和粒度对粉末冶金Ti-1Al-8V-5Fe合金组织性能的影响
张亚楠1, 刘海波2, 任浩楠2, 钟雅美2, 李强国3,4
1.西安航空学院,材料工程学院;2.西安航空学院,材料工程学院;3.四川大学,破坏力学与工程防灾减灾四川省重点实验室;4.四川大学,力学科学与工程系
摘要:
本文采用粉末冶金技术以氢化钛(TiH2)粉和不同粒径的元素粉体为原料制备Ti-1Al-8V-5Fe(Ti-185)合金,研究了压制工艺对不同粒径元素粉制备的Ti-185合金组织及性能的影响。实验结果表明,当压制压力在800 MPa,保压时间80 s,压制速率为1 mm·s-1时,Ti-185生坯密度最高,为最佳压制工艺。由粒径较小元素粉制备得到的Ti-185合金晶粒更细小,合金的烧结致密度越高。粉末粒径越小,烧结过程中合金元素实现合金化需要扩散的距离越短,有利于合金力学性能的提高,其中具有最小粒径的1#样品表现出最高的硬度(43 HRC)和强度(1438 MPa)。
关键词:  粒度,粉末冶金,Ti-1Al-8V-5Fe,相对密度,显微组织,力学性能
DOI:
分类号:TB 31???
基金项目:省级大学生创新创业训练计划项目(S201911736047);
The effect of compaction process and particle size on the microstructure and mechanical properties of PM Ti-1Al-8V-5Fe alloy
zhangYanan,Liu Haibo,Ren Haonan,Zhong Yamei,Li Qiang-guo
1.Xi’an Aeronautical University,School of Materials Engineering;2.College of Materials Science and Engineering, Sichuan University
Abstract:
The Ti-1Al-8V-5Fe (Ti-185) alloys are prepared by powder metallurgy process based on TiH2 powders and different sizes of element powders. The objective of this work is to investigate the effect of compaction process on the microstructure and mechanical properties of Ti-185 alloys prepared by different particle sizes of element powders. The results show that the Ti-185 alloy has the highest green density under the following conditions: a pressing pressure of 800 MPa, a dwell time of 80 s and a pressing rate of 1 mm·s-1 which can be considered to be the optimum pressing process. The Ti-185 alloy prepared by smaller particle size element powder has finer grain and higher sintering density. The smaller the particle size is, the shorter the diffusion distance of alloying elements in the sintering process, which is beneficial to the improvement of mechanical properties. The #1 sample with the minimum particle size presented the highest hardness (43 HRC) and strength (1438 MPa).
Key words:  particle size, powder metallurgy, Ti-1Al-8V-5Fe, relative density, microstructure, mechanical properties