Effect of compaction pressure on the densification, microstructure, and mechanical properties of Ti-1Al-8V-5Fe alloy based on TiH 2 and HDH-Ti powders

Micro & nano letters

article

Yanan Zhang¹  Xing Guo²  Yungui Chen⁴  Qiangguo Li⁵ 

[1] School of Materials Engineering, Xi'an Aeronautical University;Institute of Metal Research, Chinese Academy of Sciences;School of Materials Science and Engineering, University of Science and Technology of China;College of Materials Science and Engineering, Sichuan University;School of Materials Science and Engineering, Xi'an Polytechnic University

关键词: vanadium alloys;    hardness;    titanium;    powders;    iron alloys;    X-ray diffraction;    sintering;    crystal microstructure;    yield strength;    densification;    compaction;    aluminium alloys;    scanning electron microscopy;    titanium alloys;    titanium compounds;    mass spectroscopic chemical analysis;    hardness testing;    compressibility;    compaction pressure;    sintered density;    microstructural evolution;    mechanical properties;    densification;    dehydrogenation characteristics;    TG-MS;    O/N analysers;    scanning electron microscopy;    TiAlVFe-Ti;    TiAlVFe-TiH2;    yield strength;    self-cleaning ability;    compressibility;    α-phase;    volume fraction;    hardness tester;    electro-universal tester;    X-ray diffraction;   

DOI  :  10.1049/mnl.2018.5736

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

The high-strength of Ti-1Al-8V-5Fe (Ti-185) alloy is due to TiH 2 powders produced at different compaction pressures and compared with hydride–dehydride-Ti powders. The objective of this work was to investigate the microstructural evolution and mechanical properties of Ti-185 alloy under different compaction pressures. The dehydrogenation characteristics of TiH 2 -185 and the oxygen contents of sintered samples were evaluated by thermogravimetric analysis and mass spectrometer (TG-MS) and oxygen/nitrogen (O/N) analysers. The corresponding microstructural evolution and change in mechanical properties were analysed by means of scanning electron microscopy, X-ray diffraction, electro-universal tester, and hardness tester, respectively. Results show that with the increase in compaction pressure, the green and sintered density and densification rates increase, but the volume fraction of α -phase decreases. The TiH 2 -185 samples have higher densification and sintered density, lower oxygen content than Ti-185 samples, which is attributed to its better compressibility and superior self-cleaning ability as well as more water produced. In addition, the sintered TiH 2 -185 samples exhibit higher yield strength and hardness in comparison with the sintered Ti-185 samples. The enhanced mechanical properties are attributed to its higher density and less soft α -phase in the microstructure.

【 授权许可】

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