Microstructure and mechanical properties of ultra-fine grain AZ80 alloy processed by back pressure equal channel angular pressing

Zhang, Nianxian, Ding, Hua, Li, Jizhong, Wu, Xiaolin, Li, Yinglong and Xia, Kenong (2011) Microstructure and mechanical properties of ultra-fine grain AZ80 alloy processed by back pressure equal channel angular pressing. [in special issue: Nanomaterials by Severe Plastic Deformation: NanoSPDS] Materials Science Forum, 667-669, 547-552. (doi:10.4028/www.scientific.net/MSF.667-669).

Abstract

Experiments were conducted on AZ80 magnesium alloy by using a procedure of back pressure equal-channel angular pressing (BP-ECAP) in order to achieve submicron grain size. Microstructure was effectively refined by BP-ECAP. The gain size was found around 100~500 nm after 4 passes using both route A and route Bc at pressing temperatures of 200°C and 150 °C. The grain size was much finer in comparison with the same alloy but received conventional procedure of ECAP without back pressure, which maintains around 2~3 ?m after 8 passes at relatively high temperatures. Compression test results showed the yield strength increased with increasing applied pass. In addition, the samples processed using route A had a increasing of yield strength more obvious than that in samples processed using route Bc. The highest yield strength from the sample pressed by route A at 150 °C was more than twice of the yield strength in the solution-treated and forged condition.

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