Microstructure and Mechanical Properties of AM60 Magnesium Alloy Processed by a New Severe Plastic Deformation Technique

다국어 초록 (Multilingual Abstract)

The mechanical properties and microstructure of AM60 Magnesium alloy processed by a new cyclic extrusion channelangular pressing (CECAP) technique were investigated in this research. In this novel method, a low extrusion ratio stage wasadded at the end of the CECAP process to enhance the hydrostatic stresses and equivalent strain. The structure was refinedfrom the average grain size of ~ 76 μm for the annealed samples to 2.63 μm in the new CECAP after four passes. Whilefor the CECAP and ECAP processes, it was 3.43 and 6.98 μm, respectively. Experimental results of the proposed CECAPprocess showed an improvement in the mechanical properties after the second pass that were stopped for the ECAP process.
However, the hardness of the CECAP-processed and proposed samples was constantly increasing. This increase in hardnesswas 196% and 175% for the proposed CECAP and CECAP processes after four passes compared to the unprocessedsample, respectively. Moreover, the compressive yield stress and ultimate compressive strength of the CECAP-processedsamples were higher in all passes; however, they were smaller than those of the proposed CECAP process. The hydrostaticcompressive stresses and higher plastic strain in the proposed technique helped in further refining of the grains, which caneffectively improve the mechanical properties.

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