| 一种镍基单晶合金在不同温度下的蠕变变形机理 |
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| 引用本文： | 孙跃军,尚勇,姜晓琳.一种镍基单晶合金在不同温度下的蠕变变形机理[J].兵器材料科学与工程,2012,35(6):49-52. |
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| 作者姓名： | 孙跃军 尚勇 姜晓琳 |
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| 作者单位： | 辽宁工程技术大学材料科学与工程学院,辽宁阜新,123000;辽宁工程技术大学材料科学与工程学院,辽宁阜新,123000;辽宁工程技术大学材料科学与工程学院,辽宁阜新,123000 |
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| 摘 要： | 利用螺旋选晶法制备了一种不含Re的低成本镍基单晶合金,研究合金在不同温度下的蠕变变形机理。结果表明:在850℃×441 MPa条件下,合金的蠕变变形主要是大量位错在基体中的滑移和对增强相的切割;在950℃×250 MPa条件下,合金的蠕变变形主要是位错以层错的形式切割γ′相;在1 040℃×137 MPa条件下,合金的蠕变变形比较复杂,既有位错在基体中的滑移,也有位错攀移通过增强相,同时在γ/γ′界面处形成部分位错网。
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| 关 键 词： | 镍基单晶合金 蠕变变形 位错 攀移 层错 |
Creep deformation mechanism of a single crystal Ni-base superalloy at different temperature |
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| SUN Yuejun
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SHANG Yong
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JIANG Xiaolin.Creep deformation mechanism of a single crystal Ni-base superalloy at different temperature[J].Ordnance Material Science and Engineering,2012,35(6):49-52. |
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| Authors: | SUN Yuejun SHANG Yong JIANG Xiaolin |
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| Affiliation: | (School of Materials Science and Engineering,Liaoning Technical University,Fuxin 123000,China) |
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| Abstract: | A Ni-base superalloy was prepared by screw selecting method and the creep deformation mechanism at different temperatures was investigated.The results show that during creep testing,when the alloy ruptures at 850 ℃ and 441 MPa,the main deformation mechanism is dislocation sliding in γ matrix and the dislocation cutting to γ′.However,when the temperature increases to 950 ℃,the main deformation mechanism is dislocation cutting to γ′ phase by the formation of stacking fault.The deformation mechanism at 1 040 ℃ is more complex,dislocation climbing and cutting were observed,and some dislocation networks form at the interface of γ/γ′. |
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| Keywords: | Ni-base single crystal superalloy creep deformation dislocation dislocation climbing stacking fault |
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