Principles of ECAP–Conform as a continuous process for achieving grain refinement: Application to an aluminum alloy
Principles of ECAP–Conform as a continuous process for achieving grain refinement: Application to an aluminum alloy
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DOI：
10.1016/j.actamat.2009.10.044
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发表时间：
2010-02
期刊：
影响因子：
9.4
通讯作者：
Cheng Xu;S. Schroeder;Patrick B. Berbon;T. Langdon
中科院分区：
文献类型：
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作者：
Cheng Xu;S. Schroeder;Patrick B. Berbon;T. Langdon
双通道角挤压（ECAP）与Conform工艺相结合，为超细晶材料的连续生产提供了解决方案。通过ECAP-Conform在室温下对市售Al-6061合金的棒材进行最多四道次的加工。显微组织观察表明，晶粒明显细化，但经过4道次后，晶粒拉长，从纵向平面观察，平均宽度为150 nm，长度为1.2μm。单次通过后的显微硬度测量显示在横截面上和沿杆的沿着方向上的不均匀性。经过四次加工后，整个棒具有合理的均匀性。在垂直于挤出轴的两个正交方向上的剪切强度的测量结果显示，ECAP-Conform后显著增强，并且在经过四次加工后没有任何塑性各向异性的证据。
Equal-channel angular pressing (ECAP) combined with the Conform process provides a solution for the continuous production of ultrafine-grained materials. Rods of a commercial Al-6061 alloy were processed by ECAP–Conform at room temperature for up to a total of four passes. Microstructural observations showed significant grain refinement but with elongated grains after four passes with average widths of ∼150nm and lengths of ∼1.2μm when viewed on the longitudinal planes. Microhardness measurements after a single pass revealed inhomogeneities both on the cross-sectional planes and along the rod. After processing through four passes there was reasonable homogeneity throughout the rod. Measurements of the shear strengths in two orthogonal directions perpendicular to the extrusion axis showed significant strengthening after ECAP–Conform and there was no evidence for any plastic anisotropy after processing through four passes.