Deformation twinning with zero macroscopic strain in a coarse-grained Ni-Co-based superalloy
Deformation twinning with zero macroscopic strain in a coarse-grained Ni-Co-based superalloy
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DOI：
10.1016/j.scriptamat.2014.01.030
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发表时间：
2014-04
影响因子：
6
通讯作者：
Yunfei Xu;K. Du;C. Cui;H. Ye
中科院分区：
文献类型：
--
作者：
Yunfei Xu;K. Du;C. Cui;H. Ye
粗晶镍钴基高温合金塑性变形后出现宏观上的零应变孪晶片。双片层表现为三层重叠的层错，总体伯格矢量为零。双片层中的原子堆积顺序与相邻或相邻滑动面上的平行堆积断层对一致。高温合金的低层错能和邻近层错的剪切应力使层错拉长有利于孪晶的形成。
Macroscopically zero-strained twin lamellae are observed in a coarse-grained Ni–Co-based superalloy after plastic deformation. The twin lamellae presented as three layers of overlapping stacking faults with zero overall Burgers vector. The atomic stacking sequence in the twin lamellae is consistent with pairs of parallel stacking faults at neighboring or next-neighboring glide planes. The twinning is facilitated by the low stacking fault energy of the superalloy and the lengthening of stacking faults by shear stress from nearby stacking faults.