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首页> 外文期刊>Materials transactions >Stability of Fatigued Dislocation Wall Structure in Coarse-Grained and Ultrafine-Grained Aluminum against Monotonic Tensile Deformation
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Stability of Fatigued Dislocation Wall Structure in Coarse-Grained and Ultrafine-Grained Aluminum against Monotonic Tensile Deformation

机译：粗粒和超细粒铝中疲劳位错壁结构对单调拉伸变形的稳定性

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摘要

Coarse-grained (CG) and ultrafine-grained (UFG) pure aluminum samples fabricated by equal channel angular pressing (ECAP) were cyclically deformed at 77 K under constant plastic strain amplitude. Monotonic tensile tests were performed at 300 and 77 K soon after the fatigue tests. In spite of the increase in the tensile strength of fatigued CG Al, tensile ductility decreased remarkably in comparison to that of as-annealed CG Al. On the other hand, the ultimate tensile strength (UTS) and tensile ductility of UFG Al were much higher at 77 K than those at 300 K. Furthermore, UFG Al at 77 K maintained high UTS and high tensile ductility even after fatigue tests. Microstructural observation has revealed that dislocation wall structure formed in fatigued CG Al persists after the monotonic tensile tests. However, dislocation wall structure formed in fatigued UFG Al disappeared during early stages of monotonic tensile tests at both 300 and 77 K. These results indicate that the dislocation wall structure in UFG Al is unstable against succeeding monotonic tensile deformation.
机译：通过等通道角挤压（ECAP）制造的粗晶粒（CG）和超细晶粒（UFG）纯铝样品在恒定塑性应变振幅下于77 K循环变形。疲劳试验后不久，在300和77 K上进行了单调拉伸试验。尽管疲劳的CG Al的拉伸强度增加，但是与退火的CG Al相比，拉伸延展性显着降低。另一方面，UFG Al的极限抗拉强度（UTS）和拉伸延展性在77 K时要比300 K高得多。此外，即使在疲劳试验后，UFK Al在77 K时仍保持较高的UTS和高拉伸延展性。显微组织观察表明，疲劳的CG Al中形成的位错壁结构在单调拉伸试验后仍然存在。然而，疲劳的UFG Al中形成的位错壁结构在300 K和77 K的单调拉伸试验的早期阶段就消失了。这些结果表明UFG Al中的位错壁结构对于随后的单调拉伸变形是不稳定的。

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