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Effect of multi-pass friction stir processing on thermal distribution and mechanical properties of AZ91

机译：多通摩擦搅拌加工对AZ91的热分布和力学性能的影响

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摘要

In this paper, the effect of multi-pass friction stir processing on mechanical properties of AZ91 alloy has been studied. For this purpose, the microhardness, tensile, and creep tests were conducted at several temperatures. Optical microscopy and scanning electron micrograph were used to study the microstructure of the processed samples. The experimental results indicated that at room temperature, the microhardness, tensile, and creep strength of the processed samples as compared to the unprocessed ones increased by 23%, 29%, and 38%, respectively. Also, after friction stir processing, the tensile and creep strength of the samples at 210 degrees C increased by 31% and 47%. In addition, a three-dimensional model was developed to simulate two-pass friction stir processing using ABAQUS/Explicit software. This model involved the Johnson-Cook models for defining material behavior during the process and identifying the fracture criterion. To control the mesh distortion during consecutive passes, the Arbitrary Lagrangian-Eulerian technique was used. Using the developed model, the peak temperature, thermal distribution, and residual stress field during multi-pass friction stir processing on AZ91 have been studied. The empirical results indicated the beneficial influence of the multi-pass friction stir processing on the microstructure and high-temperature mechanical properties of AZ91 alloy.
机译：本文研究了多通摩擦搅拌加工对AZ91合金机械性能的影响。为此目的，在几个温度下进行显微硬度，拉伸和蠕变试验。光学显微镜和扫描电子显微照片用于研究加工样品的微观结构。实验结果表明，与未处理的室温，加工样品的微硬度，拉伸和蠕变强度分别增加23％，29％和38％。此外，在摩擦搅拌加工后，在210℃下样品的拉伸和蠕变强度增加了31％和47％。此外，开发了一种三维模型，用于使用ABAQUS /显式软件模拟双通摩擦搅拌加工。该模型涉及Johnson-Cook模型，用于在过程中定义材料行为并识别骨折标准。为了控制连续通道期间的网格失真，使用了任意拉格朗日 - 欧拉尼技术。研究了使用开发的模型，研究了AZ91的多通摩擦搅拌加工过程中的峰值温度，热分布和残余应力场。经验结果表明，多通摩擦搅拌加工对AZ91合金的微观结构和高温力学性能的有益影响。

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