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首页> 美国卫生研究院文献>Materials >Local Mechanical Properties and Microstructure of EN AW 6082 Aluminium Alloy Processed via ECAP–Conform Technique
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Local Mechanical Properties and Microstructure of EN AW 6082 Aluminium Alloy Processed via ECAP–Conform Technique

机译：ECAP-Conform技术处理EN AW 6082铝合金的局部力学性能和组织

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摘要

An ultrafine-grained EN AW 6082 aluminum alloy was prepared by continuous serve plastic deformation (i.e., thermo-mechanical equal channel angular pressing (ECAP)–Conform process). A miniaturized tensile testing technique was used for estimating local mechanical properties with the aim to reveal the inhomogeneity of elastic and plastic properties in a workpiece volume. These inhomogeneities may appear due to the irregular shear strain distribution in a Conformed wire. Miniaturized samples for tensile testing were cut from the Conformed workpiece. Elongation of miniaturized samples was measured with a 2D digital image correlation technique as the optical extensometer. Tensile test characteristics, such as the yield strength and ultimate tensile strength, were consequently compared with results of conventional and hardness tests. The microstructure of Conformed bars was studied in the cross-section perpendicular and parallel to the extrusion direction using scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) analysis. The microstructure of samples exhibits pronounced inhomogeneity, which is reflected by the hardness and tensile test results. Estimated distinctions between peripheral and central parts of the Conformed wires are probably a consequence of the significant strain differences realized in the upper and bottom wire parts.
机译：通过连续服务的塑性变形（即热机械等通道角挤压（ECAP）-符合工艺）制备了超细晶粒的EN AW 6082铝合金。为了揭示工件体积中弹性和塑性特性的不均匀性，使用了一种小型化的拉伸测试技术来估计局部机械特性。这些不均匀性可能是由于一致的钢丝中不规则的剪切应变分布引起的。从合格的工件上切下用于拉伸测试的微型样品。微型样品的伸长率是使用2D数字图像相关技术作为光学引伸计进行测量的。因此，将拉伸试验的特性，例如屈服强度和极限抗拉强度，与常规试验和硬度试验的结果进行了比较。使用扫描电子显微镜（SEM）和电子反向散射衍射（EBSD）分析研究了在垂直于挤压方向和平行于挤压方向的横截面中合格棒的微观结构。样品的微观结构表现出明显的不均匀性，这反映在硬度和拉伸试验结果上。一致的导线的外围部分和中心部分之间的估计差异可能是上部导线部分和下部导线部分中明显应变差异的结果。

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