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次生片層α相寬度對(duì)雙態(tài)組織TC4鈦合金動(dòng)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(xué)材料學(xué)院 沖擊環(huán)境材料技術(shù)重點(diǎn)實(shí)驗(yàn)室,北京理工大學(xué)材料學(xué)院 沖擊環(huán)境材料技術(shù)重點(diǎn)實(shí)驗(yàn)室,北京理工大學(xué)材料學(xué)院 沖擊環(huán)境材料技術(shù)重點(diǎn)實(shí)驗(yàn)室,北京理工大學(xué)材料學(xué)院 沖擊環(huán)境材料技術(shù)重點(diǎn)實(shí)驗(yàn)室,北京理工大學(xué)材料學(xué)院 沖擊環(huán)境材料技術(shù)重點(diǎn)實(shí)驗(yàn)室

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TG146.2 3

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國家自然科學(xué)基金（51172233）；廣州地區(qū)分析測試基金 (201212)


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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    摘要:

    本文研究了冷卻速率對(duì)雙態(tài)組織TC4鈦合金中次生片層α相寬度的影響,并利用分離式霍普金森壓桿,進(jìn)一步研究了次生片層α相寬度對(duì)雙態(tài)組織TC4鈦合金動(dòng)態(tài)壓縮性能及其絕熱剪切敏感性的影響。結(jié)果表明：隨著冷卻速率的降低,次生片層α相寬度隨之增寬；在動(dòng)態(tài)壓縮實(shí)驗(yàn)條件下,雙態(tài)組織TC4鈦合金的動(dòng)態(tài)抗壓強(qiáng)度隨著次生片層α相寬度的增寬,呈現(xiàn)出逐漸降低的規(guī)律,而塑性應(yīng)變則隨著次生片層α相寬度的增寬,呈現(xiàn)出逐漸增加的規(guī)律；在強(qiáng)迫剪切實(shí)驗(yàn)條件下,雙態(tài)組織TC4鈦合金的絕熱剪切敏感性隨著次生片層α相寬度的增寬,呈現(xiàn)出逐漸降低的規(guī)律,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。結(jié)合轉(zhuǎn)變?chǔ)聟^(qū)體積分?jǐn)?shù)和次生片層α相寬度對(duì)雙態(tài)組織TC4鈦合金動(dòng)態(tài)壓縮性能及其絕熱剪切敏感性的影響規(guī)律,可知：采用980℃/1h/AC+550℃/4h/AC固溶時(shí)效處理,所獲得的雙態(tài)組織TC4鈦合金,其轉(zhuǎn)變?chǔ)聟^(qū)體積分?jǐn)?shù)為80.7%,次生片層α相寬度為1.74μm,具有較好的高強(qiáng)度-低絕熱剪切敏感性匹配,綜合性能最優(yōu)。

    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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彭美旗,程興旺,鄭超,楊凱文,靳丹.次生片層α相寬度對(duì)雙態(tài)組織TC4鈦合金動(dòng)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(7):1843~1849.[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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  • 收稿日期:2015-04-01
  • 最后修改日期:2015-06-08
  • 錄用日期:2015-09-06
  • 在線發(fā)布日期: 2017-11-14
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