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Effect of Pre Aging Microstructure on the Mechanical Properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe
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1.School of Materials Science and Engineering,Inner Mongolia University of Technology;2.Northwest Institute for Nonferrous Metal Research,Xi’an

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    Abstract:

    The microstructure evolution and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy after single and duplex aging treatment were studied. The Single aging temperature was 550℃, the duplex aging was pre-aged at 400 ℃ then re-aged at 550℃. The results showed that when the alloy pre-aged at 400℃, the ω phase was precipitated. As the pre-aging time prolonged, the ω phase finally changed to the α phase. Duplex aging was effective to yield the α phase fine dispersion, and the pre precipitated isothermal ω phase provided more uniform nucleation position for precipitation of α phase than single aging so as to improve the alloy tensile strengthen greatly. During pre aging, the isothermal ω phase could precipitate sufficiently so as to provide more advantageous nucleation position to precipitate very fine α phase of acicular style, and the strengthening effect was the same with that of duplex aging.

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[Du Zhaoxin, Liu Guolong, Cui Xiaoming, Liu Huimin, Cheng Jun. Effect of Pre Aging Microstructure on the Mechanical Properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe[J]. Rare Metal Materials and Engineering,2019,48(6):1904~1908.]
DOI:10.12442/j. issn.1002-185X.20171113

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History
  • Received:December 04,2017
  • Revised:February 03,2018
  • Adopted:May 08,2018
  • Online: July 30,2019
  • Published: