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Effect of Duplex Aging on Microstructure and Mechanical Property of Ti-4Al-5Mo-6Cr-5V-1Nb alloy
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Materials Genome Institute,Shanghai University

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    Abstract:

    Effects of solution treatment, single aging treatment, and duplex aging treatment on the microstructure and mechanical property of Ti-4Al-5Mo-6Cr-5V-1Nb alloy are studied. After the solution treatment at 820 ℃ for 0.5 h, α phase completely dissolved. The hardness of single/ duplex aging treated alloys both increase at the beginning and then decrease. The alloy duplex aging treated at 300 ℃ for 8 h and 500 ℃ for 8 h processes the peak-aging hardness of 458 HV, ultimate tensile strength (UTS) of 1462 MPa and elongation of 3.4%, whose UTS is 6% higher than original alloy and even higher than single aging treated alloy. The calculation of interface energy indicates that ω phase can promote the precipitation of α phase and the refinement of α lath by decreasing the nucleation resistance of α phase by 50%, thus increasing the hardness, strength, and elongation of alloys.

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[Guo Yanlin, Luo Qun, Wang Guoqi, Liu bin, Chen Wei, Li Qian. Effect of Duplex Aging on Microstructure and Mechanical Property of Ti-4Al-5Mo-6Cr-5V-1Nb alloy[J]. Rare Metal Materials and Engineering,2020,49(4):1395~1401.]
DOI:10.12442/j. issn.1002-185X.20190028

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History
  • Received:January 08,2019
  • Revised:May 09,2019
  • Adopted:May 14,2019
  • Online: May 07,2020
  • Published: