Deformation Mechanism of L1(2)-gamma ' Phase in Bimodal gamma ''-gamma ' Precipitation Hardened Inconel 718 Superalloy
Deformation Mechanism of L1(2)-gamma ' Phase in Bimodal gamma ''-gamma ' Precipitation Hardened Inconel 718 Superalloy
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DOI：
10.1002/adem.201800652
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发表时间：
2018
影响因子：
3.6
通讯作者：
Liu Yongchang
中科院分区：
文献类型：
--
作者：
Zhang Hongjun;Li Chong;Guo Qianying;Li Huijun;Liu Yongchang
采用高分辨透射电镜（HRTEM）研究了双峰γ″-γ′沉淀硬化Inconel 718合金中L12-γ′相的变形机制。球形γ′颗粒沿方向沿着向椭球体形态转变<110>，并表现出形变各向异性，导致与γ基体的取向依赖晶格失配状态。γ′相的变形过程是由成对{100}a/2超偏位错滑移引起的APB（反相界）型剪切<10>，因此γ′相在Inconel 718合金中起到了APB强化作用。
Deformation mechanism of L12‐γ′ phase in bimodalγ″‐γ′ precipitation hardened Inconel 718 alloy is characterized through high resolution transmission electron microscopy (HRTEM) observations. The sphericalγ′ particle exhibits morphological transition toward ellipsoid along the <110> direction and shows deformation anisotropy leading to orientation‐dependent lattice misfitting status withγ‐matrix. The deformation process ofγ′ phase is determined to be of APB (anti‐phase boundary)‐type shearing induced by gliding of paired {100}a/2<10> superpartial dislocations, thusγ′ phase plays a APB‐strengthening role in Inconel 718 alloy.