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Study of the Plascticity Flow Instability Behavior of TA15 Tiatanium Alloy with Beta Transformed Microstructure
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Nanchang Hangkong University,Nanchang Hangkong University,Nanchang Hangkong University,Nanchang Hangkong University

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    Abstract:

    Isothermal constant strain rate compression tests of TA15 titanium alloy with basket-weave and Widmannstatten two types of beta transformed microstructurehave been carried out in the temperature range of 750℃-950℃ and strain rate of 0.001s-1-10s-1. The results show that there is a wide range of plastic flow instabilitySof the two beta transformed microstructure at low temperature and high strain rate region (750℃-880℃,0.0032s-1-10s-1).The instability range of Widmannstatten microstructure is larger than that of basket-weave. In the range of 750℃-775℃,0.001s-1-0.0032s-1 and 880℃-950℃,0.56s-1-10s-1 the Widmannstatten microstructure also have plastic flow instability defects.The instability defects of Widmannstatten microstructure have 45° macro shear crack, flow localization band and microcrack. The basket-weave microstructure has 45° macro shear crack and flow localization defects. The plastic flow instability is more likely to happen in Widmannstatten than basket-weave microstructure is primary cause of the difference of the initial alpha lamellar thickness in two beta transformed microstructure.

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[Dong Xianjuan, Lu Shiqiang, Wang Kelu, Ouyang Delai. Study of the Plascticity Flow Instability Behavior of TA15 Tiatanium Alloy with Beta Transformed Microstructure[J]. Rare Metal Materials and Engineering,2018,47(5):1485~1491.]
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History
  • Received:April 28,2016
  • Revised:July 25,2016
  • Adopted:August 18,2016
  • Online: June 08,2018