Transactions of Materials and Heat Treatment

Title：Investigation on microstructure and impact properties of magnesium alloy

Authors： Wu Sijun Zhang Yu

Unit： Zhejiang Industry Polytechnic College

KeyWords： magnesium alloy AZ80 extrusion-forging compound forming microstructure impact properties extrusion temperature forging temperature

ClassificationCode：TG249.2

year,vol(issue):pagenumber：2018,43(8):173-77

Abstract：

The extrusion-forging compound forming of magnesium alloy AZ80 was conducted by different process parameters,
and the influences of extrusion temperature and forging temperature on the microstructure and impact properties of
alloy were studied. The experimental results show that the average grain size of magnesium alloy AZ80 decreases first and then increases and the impact toughness increases first and then decreases with the increasing of extrusion temperature and forging temperature. When the extrusion temperature and forging temperature are 390 ℃, the average grain size of magnesium alloy AZ80 is the smallest and the impact toughness is the highest, so the grain is significantly refined and the best toughness and impact performance are obtained. Therefore,the increase of extrusion temperature and forging temperature can activate and coordinate the prismatic slip system of magnesium alloy to reduce the resistance of deformation, and then the plastic deformation of the internal structure of magnesium alloy is enhanced. The extrusion-forging compound forming is beneficial to the plastic deformation of magnesium alloy AZ80, the grain refinement and homogenization distribution are difficult to produce the crack, and the distribution of the second phase is also difficult to propagate the crack. Thus, the toughness of the extruded magnesium alloy becomes better. When the extrusion temperature or forging temperature rise to 420 ℃ continually, the size of reinforcement grain inside the magnesium alloy increases, the impact toughness decreases, and the impact properties decrease.

Funds：

浙江省公益技术应用研究计划项目(2017C31039)

吴思俊（1976-），男，硕士，讲师 E-mail：niceyunwu@sina.com

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