Transactions of Materials and Heat Treatment

Title：Influence law of die-taper angle on thermal-ironing extrusion process of magnesium alloy AZ31 bar

Authors： Lei Tongfei Pan Feng

Unit： Xijing University

KeyWords： magnesium alloy AZ31 bar thermal-ironing extrusion die-taper angle α dynamic recrystallization grain size

ClassificationCode：TG376.9

year,vol(issue):pagenumber：2017,42(11):132-135

Abstract：

Die-taper angle α is one of the important parameters influencing dynamic recrystallization behavior during thermal-ironing extrusion process of magnesium alloy profile. Therefore, through establishing the prediction model of dynamic recrystallization during thermal-ironing extrusion process for magnesium alloy AZ31 bar，the extrusion test for simulation result was conducted，and the influence law of die-taper angle α was studied. The results show that the grain size decreases gradually from the center to the surface along the radial direction，and the grain distributes in ribbon state along the axial direction. However, with the increase of α, the grain size located nearby the surface of extruded bar decreases gradually. When the die-taper angle α increases from 50° to 90°, the average grain size of the extruded surface metal is improved by 25%. The results from simulation and from actual experiments are in good agreement.

Funds：

陕西省自然科学基金资助项目(2013JM7026)；陕西省教育厅专项科研计划项目(14JK2160)；西京学院科研基金项目(XJ160118)

作者简介：雷同飞（1982-），男，硕士，副教授 E-mail：leitongfeipaper@163.com

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