| 定向凝固NiAl-28Cr-5.8Mo-0.2Hf合金的高温拉伸蠕变行为 |
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| 引用本文： | 崔传勇,郭建亭,齐义辉,叶恒强. 定向凝固NiAl-28Cr-5.8Mo-0.2Hf合金的高温拉伸蠕变行为[J]. 金属学报, 2002, 38(4): 342-346 |
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| 作者姓名： | 崔传勇 郭建亭 齐义辉 叶恒强 |
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| 作者单位： | 中国科学院金属研究所,沈阳,110016 |
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| 基金项目： | 国家自然科学基金重大项目 59895152，国家 863高技术项目715—005—0030资助~~ |
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| 摘 要： | 研究了定向凝固NiAl-28Cr-5.8Mo-0.2Hf合金的显微组织和在982－1100℃,50-124MPa应力下的高温蠕变行为，该合金是由NiAl相。Cr(Mo)相和少量Hf的固溶体相组成。蠕变测试结果表明：蠕变曲线是由较短的减速蠕变阶段和较长的加速蠕变阶段组成，且蠕变后的显微组织变化不大，蠕变变形机制是由位错攀移机制所控制。加强蠕变阶段蠕变速率的增加是由于裂纹的形成与扩展引起的。
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| 关 键 词： | 定向凝固 NiAl合金 拉伸蠕变 蠕变机制 金属间化合物 |
| 文章编号： | 0412-1961(2002)04-0342-05 |
| 修稿时间： | 2001-09-12 |
TENSILE CREEP BEHAVIOR OF DIRECTIONALLY SOLIDIFIED NiAl-28Cr-5.8Mo-0.2Hf ALLOY |
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| CUI Chuanyong,GUO Jianting,QI Yihui,YE Hengqiang Institute of Metal Research,The Chinese Academy of Sciences,Shenyang Correspondent:GUO Jianting,professor,Tel:. TENSILE CREEP BEHAVIOR OF DIRECTIONALLY SOLIDIFIED NiAl-28Cr-5.8Mo-0.2Hf ALLOY[J]. Acta Metallurgica Sinica, 2002, 38(4): 342-346 |
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| Authors: | CUI Chuanyong GUO Jianting QI Yihui YE Hengqiang Institute of Metal Research The Chinese Academy of Sciences Shenyang Correspondent:GUO Jianting professor Tel: |
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| Affiliation: | CUI Chuanyong,GUO Jianting,QI Yihui,YE Hengqiang Institute of Metal Research,The Chinese Academy of Sciences,Shenyang 110016 Correspondent:GUO Jianting,professor,Tel: |
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| Abstract: | The microstructure and tensile creep behaviors of NiAl-28Cr-5.8Mo-0.2Hf alloy were studied at 982 1100 t under the applied stress of 50 124 MPa. The alloy is composed of NiA1 phase, Cr(Mo) phase and Hf-rich phase. The obtained creep curves have similar shape: a short primary creep and long accelerated creep stages. The post-creep microstructure is almost the same as the original microstructure. The dominant creep deformation mechanism is controlled by the climb of dislocations. The increase of creep rate at beginning of the accelerated creep stage is related to the nucleation and propagation of creep cracks. |
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| Keywords: | NiAl alloy tensile creep creep deformation mechanism |
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