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轉變β區(qū)體積分數(shù)對雙態(tài)組織TC4鈦合金動態(tài)壓縮性能及其絕熱剪切敏感性的影響規(guī)律
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北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室

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TG146.2 3

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國家自然科學基金（51005071）；河南理工大學青年骨干教師資助計劃


Effects of the volumn fraction of transformed β matrix 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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    摘要:

    本文研究了固溶溫度對雙態(tài)組織TC4鈦合金中轉變β區(qū)體積分數(shù)的影響,并利用分離式霍普金森壓桿,進一步研究了轉變β區(qū)體積分數(shù)對雙態(tài)組織TC4鈦合金動態(tài)壓縮性能及其絕熱剪切敏感性的影響。結果表明：隨著固溶溫度的升高,轉變β區(qū)的體積分數(shù)隨之增加；在動態(tài)壓縮實驗條件下,雙態(tài)組織TC4鈦合金的動態(tài)抗壓強度隨著轉變β區(qū)體積分數(shù)的增加,呈現(xiàn)出先升高后降低的規(guī)律,且在轉變β區(qū)體積分數(shù)為80.7%時出現(xiàn)最大值,而塑性應變則隨著轉變β區(qū)體積分數(shù)的增加,呈現(xiàn)出依次降低的規(guī)律；在強迫剪切實驗條件下,雙態(tài)組織TC4鈦合金的絕熱剪切敏感性隨著轉變β區(qū)體積分數(shù)的增加,呈現(xiàn)出先降低后升高的規(guī)律,且在轉變β區(qū)體積分數(shù)為80.7%時出現(xiàn)最低值；且各雙態(tài)組織TC4鈦合金均隨著撞擊桿初速的提高,其絕熱剪切敏感性增加。

    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 volume fraction of transformed β matrix were obtained via different heat treatment. The results showed that the volume fraction of transformed β matrix increased with the increasing of solution temperature. Under dynamic compression experiments, the dynamic strength rised at first and went down latter as the volume fraction of transformed β matrix increased, and reaches its maximum value when the volume fraction of transformed β matrix was 80.7%. While the dynamic strain decreased with the increasing of volume fraction of transformed β matrix. Under forced shearing experiments, the sensitivity of adiabatic shear banding decreased at first and increased latter as the volume fraction of transformed β matrix increased, and reached its minimum value when the volume fraction of transformed β matrix was 80.7%. Besides, the sensitivity of adiabatic shear banding increased for the same microstructure with the increasing of impact velocity.

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彭美旗,程興旺,鄭超,楊凱文,靳丹.轉變β區(qū)體積分數(shù)對雙態(tài)組織TC4鈦合金動態(tài)壓縮性能及其絕熱剪切敏感性的影響規(guī)律[J].稀有金屬材料與工程,2017,46(8):2227~2233.[PENG Meiqi, CHENG Xingwang, ZHENG Chao, YANG Kaiwen, JIN Dan. Effects of the volumn fraction of transformed β matrix on Dynamic Mechanical Properties and Sensitivity of Adiabatic Shear Banding in bimodal microstructures of TC4 alloy[J]. Rare Metal Materials and Engineering,2017,46(8):2227~2233.]
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  • 收稿日期:2015-04-01
  • 最后修改日期:2015-05-13
  • 錄用日期:2015-09-06
  • 在線發(fā)布日期: 2017-11-16
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