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Mg15Al镁合金ECAP变形过程中β相的碎化机理及动态析出行为
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-12-08
为了改善Mg-Al系合金中β-Mg17Al12相的形态、大小和分布，充分发挥其沉淀强化作用，利用能产生强塑性变形的等通道转角挤压法挤压Mg15Al高铝镁合金；采用XRD、SEM、EDS和TEM研究不同道次ECAP挤压后Mg15Al高铝镁合金中β-Mg17Al12相的演变。
Mg15Al镁合金ECAP变形过程中β相的碎化机理及动态析出行为Fragmentation mechanism and dynamic precipitation behavior of β phase in Mg15Al magnesium alloy during ECAP
为了改善Mg-Al系合金中β-Mg17Al12相的形态、大小和分布，充分发挥其沉淀强化作用，利用能产生强塑性变形的等通道转角挤压法挤压Mg15Al高铝镁合金；采用XRD、SEM、EDS和TEM研究不同道次ECAP挤压后Mg15Al高铝镁合金中β-Mg17Al12相的演变。结果表明：ECAP强塑性变形能够有效地碎化Mg15Al高铝镁合金中粗大的网状共晶β-Mg17Al12相；随挤压道次的增加，β-Mg17Al12相尺寸逐渐减小，挤压4道次后，网状共晶β-Mg17Al12相被破碎成尺寸在5 μm以下的小块，分布得到一定改善；由于高应力与高温的共同作用，挤压2道次后，部分β-Mg17Al12相发生回溶，挤压4道次后，在α-Mg基体中动态析出许多尺寸在200 nm以下的粒状β-Mg17Al12相。
In order to improve the morphology, size and distribution of β-Mg17Al12 phase in the Mg-Al alloy and fulfill the precipitation strengthening effect of β-Mg17Al12 phase, Mg15Al high-aluminum magnesium alloy was processed by equal channel angular pressing. The evolution of β-Mg17Al12 phase in the Mg15Al high-aluminum magnesium alloy after equal channel angular pressing (ECAP) for different passes was investigated by XRD, SEM, EDS and TEM. The results show that the coarse network eutectic β-Mg17Al12 phase in Mg15Al high aluminum-magnesium alloy can be effectively fragmentized by ECAP. With increasing extrusion passes, the size of β-Mg17Al12decreases. After ECAP for 4 passes, β phase is fragmentized into small lump-shaped particles with size of less than 5 μm and the distribution of β phase becomes more homogeneous. Meanwhile, due to the large shear stress and high temperature, the dissolution of β phase in matrix occurs after ECAP for 2 passes and a large number of granular β phase with the size below 200 nm precipitates from the matrix after ECAP for 4 passes.
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