Interfacial structure and growth mechanisms of lath-shaped precipitates in Ni-45 wt° Cr
Interfacial structure and growth mechanisms of lath-shaped precipitates in Ni-45 wt° Cr
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DOI：
10.1080/01418619808241911
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发表时间：
1998-02
影响因子：
1.6
通讯作者：
J. K. Chen;G. Chen;W. Reynolds
中科院分区：
文献类型：
--
作者：
J. K. Chen;G. Chen;W. Reynolds
摘要用透射电镜和高分辨电镜研究了从富镍fee基体中析出的bcc板条的界面结构。分析了50个析出物及其附近的200多个缺陷。HREM图像表明Kurdjumov-Sachs取向关系的平行共轭平面在板条的宽面上是连续的。与早期的研究一致，（121）f习惯面包含结构壁架，不规则间隔的位错，但没有规则的失配位错阵列。惯习面中的87°位错在共轭面中具有Burgers矢量。这些位错存在于生长壁架的边缘，当壁架迁移时，位错必须爬升。位错在取向关系的共轭平面内容纳错配，而垂直于这些平面的错配由弹性应变补偿。发现从沉淀惯习面延伸到基体中的堆垛层错。
Abstract The interfacial structure of bcc laths precipitated from a nickel-rich fee matrix were studied using transmission electron microscopy and high-resolution electron microscopy (HREM). 50 precipitates and more than 200 defects in their vicinity were analysed. HREM images indicate the parallel conjugate planes of the Kurdjumov-Sachs orientation relationship are continuous across the broad face of the laths. In agreement with earlier studies, the (121)f habit plane contains structural ledges, irregularly spaced dislocations but no regular array of misfit dislocations. 87° of dislocations in the habit plane have Burgers vectors in the conjugate plane. These dislocations are found in the risers of growth ledges and must climb as the ledges migrate. The dislocations accommodate misfit in the conjugate planes of the orientation relationship while misfit perpendicular to these planes is compensated by elastic strain. Stacking faults found extending into the matrix from the precipitate habit plane accommoda...