Boride-induced dislocation channeling in a single crystal Ni-based superalloy

Boride-induced dislocation channeling in a single crystal Ni-based superalloy
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单晶镍基高温合金中硼化物引起的位错沟道

DOI:
10.1016/j.matlet.2018.10.039
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发表时间:
2019-01
期刊:
影响因子:
3
通讯作者:
Ma X. L.
Ma X. L.
中科院分区:
材料科学3区
文献类型:
--
作者:
Ge H. L.;Liu J. D.;Zheng S. J.;Zhou Y. T.;Jin Q. Q.;Shao X. H.;Zhang B.;Zhou Y. Z.;Ma X. L.

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通常,在高温合金中添加微量元素如碳和硼以强化晶界。然而,碳和硼对单晶高温合金的影响仍然存在争议。本文证明了M_(23)B_6(M为W、Mo、Cr和Ni的混合物)在Ni基单晶高温合金中能诱发位错沟道。M23 B6与基体之间存在立方对立方的取向关系,形成了大部分{1 1 1}面界面。此外,原子台阶{1 1 1}界面可以促进位错形核。界面处的位错在通道中向前滑移并堆积,导致应变局部化和蠕变裂纹萌生。
Generally, minor elements such as carbon and boron are added in superalloys to strengthen grain boundaries. However, effects of carbon and boron on single crystal superalloys remain disputed. Here we demonstrate that M23B6(where M is mixture of W, Mo, Cr and Ni) can induce dislocation channeling in a Ni-based single crystal superalloy. The M23B6has a cube-on-cube orientation relationship with the matrix, forming a majority of {1 1 1} plane interfaces. Furthermore, the atomic stepped {1 1 1} interface could facilitate dislocation nucleation. Dislocations emitted from the interface glide forward and pile-up in the channel, resulting in strain localization and creep micro-crack initiation.
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