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Abstract SEM， XRD and EBSD were used to study the tensile fracture and microstructure evolution during deformation of rapidly solidified Mg-8Zn-0.5Y magnesium alloy， and the effect of stretching temperature on the microstructure and properties of the alloy was analyzed. The results show that the Mg-8Zn-0.5Y magnesium alloy is composed of quasi crystal Mg3Zn6Y and α-Mg， with the average grain size of 60 μm. With the increasing of stretching temperature， the tensile strength and yield strength of the magnesium alloy decrease， while the elongation increases apparently. The tensile fracture of the alloy is uneven at room temperature， and there are a large number of flat round dimples after tensile at 300 ℃. The volume fraction of the deformed microstructure in rapidly solidified Mg-8Zn-0.5Y magnesium alloy is 23% and its width is 2 μm at room temperature. As the stretching temperature increases to 300 ℃， the large angle grain boundary cellular structure with larger orientation difference and parallel distribution is formed in the grains.
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Received: 01 November 2017
Published: 26 June 2018
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2018, Vol. 28 
