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The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature
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1.Xi’an Jiaotong University,State Key Laboratory for Mechanical Behavior of Materials,Xi’an;2.Central South University,State Key Laboratory for Powder Metallurgy

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    Abstract:

    The microstructures and precipitation hardening of Ti1023 and Ti5553 alloys in the same solution treatment and step-quench aging treatment (ST-SQA) have been studied. The morphology of α phase about precipitation and distribution in different aging treatment were observed carefully by using SEM and TEM, and the variation of density and width of secondary α phase were analyzed. The hardness of these two alloys was measured. The result shows that: Ti1023 alloy is more likely to precipitate α phase than Ti5553 alloy due to low stability of ? phase. Ti1023 alloy precipitates α phase at 300℃ aging and get the maximum density of precipitation at 400℃,while Ti5553 alloy precipitates α phase at 450℃, and get the maximum density of precipitation at 550℃. As for Ti1023 alloy, the peak of hardness is obtained at 400℃ aging, while as for Ti5553 alloy, double peaks of hardness are shown at 350℃ and 550℃ aging, respectively. The variation of hardness was caused by the precipitation of secondary phase in ? phase for different aging temperatures. When aging temperature is below 400℃, the hardness of Ti1023 alloy depends on both α phase and ω phase, and the hardness of Ti15553 alloy depends on only ω phase. As aging temperature is over 400℃, the hardness of both Ti1023 and Ti5553 alloys depend on the density of precipitation and the size of α phase.

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[Wenting Wang, Pei Li, Qiaoyan Sun, Bin Liu, Lin Xiao, Jun Sun. The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature[J]. Rare Metal Materials and Engineering,2020,49(5):1707~1714.]
DOI:10.12442/j. issn.1002-185X.20190157

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History
  • Received:February 26,2019
  • Revised:June 26,2019
  • Adopted:July 02,2019
  • Online: June 05,2020
  • Published: