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Ti40阻燃合金粗晶超塑性變形行為及機理
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國家“973”計劃（2007CB613807）；國家科技支撐計劃 (2007BAE07B01)


Superplastic Deformation Behavior and Mechanism of Burn-Resistant Ti40 Alloy with Large Grains
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    摘要:

    借助OM、TEM研究了高溫條件下Ti40阻燃合金的粗晶超塑性變形行為及機理。結(jié)果表明：在920 ℃下，應(yīng)變速率為5×10-5~1×10-2 s-1的Ti40合金表現(xiàn)出良好的超塑性行為，拉伸延伸率均超過250%，應(yīng)變速率敏感指數(shù)m大于0.3。超塑變形后，粗大的等軸組織細化。TEM分析表明，在變形過程中，位錯運動形成亞晶界，亞晶界通過吸收滑移位錯形成小角度晶界甚至大角度晶界。Ti40合金的粗晶超塑性是由動態(tài)回復(fù)和再結(jié)晶共同作用的結(jié)果。

    Abstract:

    The superplastic deformation behavior and mechanism of burn-resistant Ti40 alloy with large grains at elevated temperature were investigated by OM and TEM. Results show that Ti40 alloy exhibits excellent superplastic behavior in the strain rate range from 5×10-5 to 1×10-2 s-1 at 920 ℃. All of the tensile elongations exceed 250% while the strain rate sensitivity index m is over 0.3. Optical microstructure shows that the large equiaxed gains are refined after superplastic deformation. TEM observation indicates that an unstable subgrain boundary formed by dislocation during superplastic deformation. The subgrain boundaries were transformed into low- and even high-angle grain boundaries by absorbing gliding dislocations. The superplastic behavior of large-grained Ti40 alloy could be explained by dynamic recovery and recrystallization.

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張學(xué)敏,趙永慶,曾衛(wèi)東,藺 偉. Ti40阻燃合金粗晶超塑性變形行為及機理[J].稀有金屬材料與工程,2010,39(3):433~436.[Zhang Xuemin, Zhao Yongqing, Zeng Weidong, Lin Wei. Superplastic Deformation Behavior and Mechanism of Burn-Resistant Ti40 Alloy with Large Grains[J]. Rare Metal Materials and Engineering,2010,39(3):433~436.]
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  • 收稿日期:2009-07-30
  • 最后修改日期:2010-01-11
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