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首页> 外文期刊>Journal of Materials Engineering and Performance >Micromechanism of High-Temperature Tensile Deformation Behavior of a Directionally Solidified Nickel Base Superalloy
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Micromechanism of High-Temperature Tensile Deformation Behavior of a Directionally Solidified Nickel Base Superalloy

机译：定向凝固镍基超合金高温拉伸变形行为的微观机制

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摘要

High-temperature tensile deformation behavior of directionally solidified nickel base superalloy CM 247 DS is studied by conducting tensile tests in temperature range RT-955 A degrees C employing a constant strain rate of 10(-3) s(-1) and carrying out extensive electron microscopic examinations to understand the concomitant substructural evolution. The alloy exhibits yield strength anomaly (YSA) behavior like many other superalloys, and the yield strength maxima occur at 750 A degrees C. However, unlike in most of the superalloys, ductility continuously increases with temperature. The deformation behavior of the alloy changes significantly with temperature. Transmission electron microscopic examination confirmed that at lower temperature (aecurrencyA 750 A degrees C), gamma' shearing is the dominant deformation mechanism; whereas at temperatures above 750 A degrees C, thermally activated dislocation looping around gamma' precipitate is dominant. Substructures evolved during deformation at 750 A degrees C consists mainly of superlattice stacking faults (SSFs) inside gamma' precipitates, whereas at 850 A degrees C uniform dislocation tangles are observed in gamma matrix. Superlattice stacking faults result from shearing of gamma' precipitate by a/3aOE (c) 112 dislocations, which arise from the decomposition of a/2aOE (c) 110 matrix dislocations. YSA in this alloy is attributed to dislocation interactions inside gamma'; however, the enhanced ductility even at 750 A degrees C is due to formation of SSFs.
机译：通过在使用恒定应变率为10（-3）（-1）的温度范围RT-955 A℃下进行拉伸试验，研究了方向固化的镍基超合金CM 247ds的高温拉伸变形特性。电子显微镜考试理解伴随的副结构演化。合金表现出屈服强度异常（YSA）行为，如许多其他高温合金，屈服强度最大值发生在750℃下。然而，与大多数超合金中不同，延展性与温度连续增加。用温度显着变化合金的变形行为。透射电子显微镜检查证实，在较低温度（AE＆ oe＆ a 750℃），γ'剪切是主导变形机制;然而，在750以上的温度下，γ沉淀物周围的热激活位移循环是显性的。在750时变形在变形期间演化的子结构主要由γ'沉淀物内的超晶格堆叠故障（SSF）组成，而在γ基质中观察到850℃均匀的位错缠结。超廓图堆叠故障是由于A / 3aoE（c）112＆gt的剪切沉淀出来导致糊状物。从A / 2AOE（c）110＆gt的分解产生的脱臼。矩阵脱位。这种合金中的YSA归因于伽玛内的错位相互作用;然而，即使在750℃下也是增强的延展性是由于SSF的形成。

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