压制工艺和粒径对粉末冶金Ti-1Al-8V-5Fe合金组织性能的影响
作者:
作者单位:

1.西安航空学院材料工程学院,西安 710077;2.四川大学破坏力学与工程防灾减灾四川省重点实验室,成都 610065;3.四川大学力学科学与工程系,成都 610065

作者简介:

张亚楠, 1987年出生,博士,高级工程师,研究方向为钛合金粉末冶金。E-mail:582798209@qq.com

通讯作者:

李强国,1989年出生,博士,研究方向为金属材料及其疲劳与断裂。E-mail:850505429@qq.com

基金项目:

省级大学生创新创业训练计划项目(S201911736047);国家自然科学基金(52003181);四川省科技厅应用基础研究项目(21YYJC2442)


Effect of Compaction Process and Particle Size on the Microstructure and Mechanical Properties of PM Ti-1Al-8V-5Fe Alloy
Author:
Affiliation:

1.School of Materials Engineering, Xi’an Aeronautical University,Xi’an 710077;2.Failure Mechanics & Engineering Disaster Prevention and Mitigation,Key Laboratory of Sichuan Province, Sichuan University, Chengdu 610065;3.Department of Mechanics and Engineering Science, Sichuan University,Chengdu 610065

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    摘要:

    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。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合金晶粒越细小,合金的烧结致密度就越高。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就越短,越有利于合金力学性能的提高,其中具有最小粒径的样品表现出最高的硬度(43 HRC)和强度(1 438 MPa)。

    Abstract:

    The Ti-1Al-8V-5Fe (Ti-185) alloys were prepared by powder metallurgy process based on TiH2 powders and different sizes of element powders.The effect of compaction process on the microstructure and mechanical properties of Ti-185 alloys prepared by different particle sizes of element powders was investigated. The results indicate 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,which can be considered to be the optimum pressing process. The smaller particale size of Ti-185 alloy is, the higher sintering density of alloy is.The smaller particle size element powder is favorable to shorten the atoms diffusion distance of alloying elements during the sintering process, resulting in enhancing mechanical properties of Ti-185 alloy.Consequently,the sample with the minimum particle size displays the highest hardness (43 HRC) and strength (1 438 MPa).

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张亚楠,刘海波,任浩楠,钟雅美,李强国.压制工艺和粒径对粉末冶金Ti-1Al-8V-5Fe合金组织性能的影响[J].宇航材料工艺,2020,50(6):64-68.

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  • 收稿日期:2020-05-14
  • 最后修改日期:2020-07-24
  • 录用日期:2020-08-28
  • 在线发布日期: 2021-01-15