Effect of rhenium and ruthenium on the deformation and fracture mechanism in nickel-based model single crystal superalloys during the in-situ tensile at room temperature

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• 作者：C.P. Liu^a ; X.N. Zhang^a ; ^{xnzhang@bjut.edu.cn} ; L. Ge^a ; S.H. Liu^b ; C.Y. Wang^c ; ^d ; T. Yu^d ; Y.F. Zhang^a ; Z. Zhang^e ; ^{zezhang@zju.edu.cn}
• 关键词：Nickel-based model single crystal superalloys ; In-situ tensile experiment ; Fracture ; Dislocation configurations
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：90-97
• 全文大小：2310 K
• 卷排序：682

文摘

In-situ tensile experiments of Ni-Al, Ni-Al-Re and Ni-Al-Re-Ru model single-crystal superalloys were performed in scanning electron microscope (SEM) at room temperature. The plastic deformation mechanisms of all the three model superalloys were double-oriented slipping of dislocations. Micro-cracks were often formed at the intersection of two sets of slip lines. The fracture surfaces of Ni-Al and Ni-Al-Re-Ru alloys were nearly parallel to (010) planes and that of the Ni-Al-Re alloys was nearly parallel to (1−11) plane. The dislocation configuration was analyzed by transmission electron microscopy (TEM). The a/2<110> dislocation pairs coupled with antiphase boundary (APB) cut into γʹ phase in the Ni-Al and Ni-Al-Re-Ru model superalloys. In addition to these dislocations, stacking faults also cut into γʹ phase in Ni-Al-Re model superalloys. The different fracture surfaces of different model single-crystal superalloys were attributed to the influence of elements Re and Ru on the dislocation configuration.