The Strain-Hardening Behavior of TZAV-30 Alloy After Various Heat Treatments

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• 作者：S. X. Liang ; L. X. Yin ; L. Y. Zheng…
• 关键词：heat treatment ; microstructure ; strain hardening ; titanium alloys
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：25
• 期：2
• 页码：530-535
• 全文大小：1,133 KB
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• 作者单位：S. X. Liang (1)
  L. X. Yin (1)
  L. Y. Zheng (1)
  M. Z. Ma (2)
  R. P. Liu (2)
  
  1. College of Equipment Manufacture, Hebei University of Engineering, Handan, 056038, China
  2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024

文摘

The Ti-Zr-Al-V series titanium alloys with excellent mechanical properties and low density exhibit tremendous application potential as structural materials in aviation, automotive, and navigation industries. The strain-hardening behavior of Ti-30Zr-5Al-3V (wt.%, TZAV-30) alloy with various heat treatments is investigated in this study. Experimental results show that strain-hardening behavior of the examined alloy depends on the heat treatment process. The average strain-hardening exponent, n, is approximately 0.061 for WA specimen (825 °C/0.5 h/water quenching + 600 °C/4 h/air cooling), 0.068 for FC (850 °C/0.5 h/furnace cooling), 0.121 for AC (850 °C/0.5 h/air cooling), and 0.412 for WQ (850 °C/0.5 h/water quenching). Analysis of strain-hardening rate versus true strain curves indicates that higher n of AC specimen results from the lower degradation rate of strain-hardening rate with strain, and the ultrahigh n of WQ specimen is attributed to the evident increase in strain-hardening rate at the true strain from 0.04 to 0.06. Phase constitution and microstructural analyses reveal that the n of the examined alloy with α + β phases increases with the increase in the relative content of the retained β phase but is independent of average thickness of α plates. The increase in strain-hardening rate in WQ specimen depends on metastable α″ martensite and martensitic transition induced by tensile stress. Keywords heat treatment microstructure strain hardening titanium alloys