Improving mechanism of both strength and ductility of GH4169 alloy induced by electric-pulse treatment
Improving mechanism of both strength and ductility of GH4169 alloy induced by electric-pulse treatment
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电脉冲处理提高GH4169合金强度和塑性的机理
DOI：
10.1016/j.msea.2018.03.087
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发表时间：
2018-05
期刊：
影响因子：
6.4
通讯作者：
Cao Xingzhong
中科院分区：
文献类型：
--
作者：
An Jinlan;Wang Lei;Song Xiu;Liu Yang;Gai Zeyu;Cao Xingzhong
研究了GH4169合金经800 °C电脉冲时效后的组织特征，并测试了合金的高温拉伸性能。拉伸试验结果表明，与常规时效合金相比，EPT时效合金的极限应力、屈服应力和断裂伸长率同时提高。正电子湮没谱表明，与常规时效相比，EPT时效后的合金中空位浓度增加。空位浓度的增加导致拉伸变形初期屈服应力的增加。此外，空位诱导纳米级γ′′相在高温拉伸变形过程中析出，是提高强度和塑性的关键因素。同时，EPT诱导部分γ′′相（时效析出）在位错周围析出，阻碍位错运动。
The microstructure characteristics of GH4169 alloy aged with electric-pulse treatment (EPT) at 800 °C were investigated and tensile properties were examined at high temperature. The tensile test results indicate that the ultimate stress, yield stress and fracture elongation increase simultaneously in the alloy aged with EPT compared with that of normal aged alloy. The vacancy concentration of the alloy aged with EPT increases proved by positron annihilation spectrometer compared with that of normal aged alloy. Vacancy concentration increase leads to increasing of yield stress at the initial stage of tensile deformation. Farther, vacancy induces ultrafine nm-sized γ′′ phase to precipitate during tensile deformation at high temperature, which is the key factor on strength and ductility improvement. Meanwhile, EPT induces parts of γ′′ phase (precipitating during aged treatment) to precipitate around dislocation which impedes dislocation motion.
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DOI：
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DOI：
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期刊：
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