s) were obtained via different heat treatment. The results showed that the width of αs increased with the decreasing of cooling rate. Under dynamic compression experiments, the dynamic strength decreased as the width of αs increased; while the dynamic strain exhibited an opposite trend. Under forced shearing experiments, the sensitivity of adiabatic shear banding decreased as the width of αs increased. Besides, the sensitivity of adiabatic shear banding increased for the same microstructure with the increasing of impact velocity. Combined with the effects of volumn fraction of transformed β and width of αs on dynamic mechanical properties and sensitivity of adiabatic shear banding of TC4 alloy, the bimodal microstructure obtained by the heat treatment,980℃/1h/A+550℃/4h/A, had good high strength and low sensitivity of adiabatic shear banding matching. The optimal bimodal microstructure had a volumn fraction of transformed β matrix of 80.7% and the width of αs plates was 1.74 μm."/>

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Effects of the width of secondary α phase on Dynamic Mechanical Properties and Sensitivity of Adiabatic Shear Banding in bimodal microstructures of TC4 alloy
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National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology

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TG146.2 3

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    Abstract:

    In this paper, the dynamic mechanical properties and sensitivity of adiabatic shear banding of TC4 alloy having bimodal microstructures were invesgated using Split Hopkinson Bar.The bimodal microstructures with different width of secondary α phase (αs) were obtained via different heat treatment. The results showed that the width of αs increased with the decreasing of cooling rate. Under dynamic compression experiments, the dynamic strength decreased as the width of αs increased; while the dynamic strain exhibited an opposite trend. Under forced shearing experiments, the sensitivity of adiabatic shear banding decreased as the width of αs increased. Besides, the sensitivity of adiabatic shear banding increased for the same microstructure with the increasing of impact velocity. Combined with the effects of volumn fraction of transformed β and width of αs on dynamic mechanical properties and sensitivity of adiabatic shear banding of TC4 alloy, the bimodal microstructure obtained by the heat treatment,980℃/1h/A+550℃/4h/A, had good high strength and low sensitivity of adiabatic shear banding matching. The optimal bimodal microstructure had a volumn fraction of transformed β matrix of 80.7% and the width of αs plates was 1.74 μm.

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[PENG Meiqi, CHENG Xingwang, ZHENG Chao, YANG Kaiwen, JIN Dan. Effects of the width of secondary α phase on Dynamic Mechanical Properties and Sensitivity of Adiabatic Shear Banding in bimodal microstructures of TC4 alloy[J]. Rare Metal Materials and Engineering,2017,46(7):1843~1849.]
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History
  • Received:April 01,2015
  • Revised:June 08,2015
  • Adopted:September 06,2015
  • Online: November 14,2017
  • Published: