(1. 山東大學(xué) 模具工程技術(shù)研究中心，濟(jì)南 250061；
2. 山東建筑大學(xué) 材料科學(xué)與工程學(xué)院，濟(jì)南 250101)
摘 要: 以AZ31鎂合金為研究對象，通過對不同模具外角ECAP變形過程的有限元模擬，研究不同模具外角下AZ31鎂合金ECAP變形的等效應(yīng)變分布。利用微觀組織觀察以及硬度測試，分析等效應(yīng)變分布對微觀組織及力學(xué)性能影響。結(jié)果表明：當(dāng)模具外角ψ為20°時(shí)，工件可以獲得均勻的等效應(yīng)變分布。AZ31鎂合金經(jīng)過ECAP擠壓后，微觀組織顯著細(xì)化，力學(xué)性能明顯改善，但平均晶粒尺寸及微觀維氏硬度在工件橫截面上分布不均勻，等效應(yīng)變分布的不均勻性是導(dǎo)致材料微觀組織和力學(xué)性能不均勻的主要因素之一。
關(guān)鍵字: 等通道擠壓；有限元模擬；變形均勻性分析；AZ31鎂合金
（1. Engineering Research Center for Mould and Die Technology, Shandong University, Jinan 250061, China;
2. School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China）
Abstract:The effective strain size and distribution of AZ31 magnesium deformed by equal channel angular pressing (ECAP) for different die corner angles were investigated through the finite element simulation. The effect of the stain distribution in pressed workpiece on the microstructure and mechanical properties of the pressed workpiece was explored by optical observation and micro-hardness testing. The results show that the effective strain distribution in the samples is more homogeneous at 20° than those at other angles. After the AZ31 magnesium alloy is processed by ECAP, its microstructure is significantly refined and its mechanical property is improved, but the distribution of the grain size and micro-hardness in the cross-section of the pressed samples is inhomogeneous. The inhomogeneous distribution of the effective strain is one of the main factors that lead to the uneven microstructure and property.
Key words: equal channel angular pressing; finite element simulation; homogenous deformation analysis; AZ31 magnesium alloy
