| 脉冲电流对2091Al—Li合金超塑性及断裂行为的影响 |
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| 引用本文： | 刘志义,崔建忠,白光润.脉冲电流对2091Al—Li合金超塑性及断裂行为的影响[J].金属学报,1993,29(2):41-44. |
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| 作者姓名： | 刘志义 崔建忠 白光润 |
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| 作者单位： | 东北工学院
(刘志义，崔建忠)，东北工学院(白光润) |
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| 摘 要： | 研究了脉冲电流对2091 Al-Li合金在高速超塑变形时的力学行为及断裂机制的影响。结果表明:施加脉冲电流使2091 Al-Li合金在高应变速度(10~(-2)s~(-1))时仍具有较高的应力应变速度敏感指数和超塑性能。扫描电镜观察表明,施加脉冲电流使2091 Al-Li合金的断裂机制由晶界撕裂转变成典型的超塑断裂-在粒子及晶界处形成孔洞,相互连接以至断裂。
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| 关 键 词： | 超塑性 断裂 铝锂合金 脉冲电流 |
| 收稿时间： | 1993-02-18 |
| 修稿时间： | 1993-02-18 |
EFFFECT OF CURRENT PULSE ON SUPERPLASTICITY AND FRACTURE BEHAVIOUR OF 2091 Al-Li ALLOY |
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| LIU Zhiyi,CUI Jianzhong,BAI Guangrun Northeast University of Technology,Shenyang.EFFFECT OF CURRENT PULSE ON SUPERPLASTICITY AND FRACTURE BEHAVIOUR OF 2091 Al-Li ALLOY[J].Acta Metallurgica Sinica,1993,29(2):41-44. |
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| Authors: | LIU Zhiyi CUI Jianzhong BAI Guangrun Northeast University of Technology Shenyang |
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| Abstract: | Effects of current pulse on mechanical behaviors and fracture mechanism of
2091 Al-Li superplastically deformed at high strain rate have been investigated. Applying a
direct current pulse makes the 2091 Al-Li alloy still with high stress-strain rate sensiitivity
exponent and superplastic properties under superplastically deformed at high strain rate of
10~(-2)s~(-1). SEM observation showed that the fracture for 2091 Al-Li alloy, superplastically de-
formed at high strain rate by applying current pulse, transforms from intergranular tear to
typical superplastic failure, i. e., fracture by formation and coalescene of cavities at particles
and boundaries. |
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| Keywords: | current pulse superplasticity fracture Al-Li alloy |
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