新聞資訊
Mg15Al鎂合金ECAP變形過程中β相的碎化機理及動態析出行為
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-08
為了改善Mg-Al系合金中β-Mg17Al12相的形態、大小和分布，充分發揮其沉淀強化作用，利用能產生強塑性變形的等通道轉角擠壓法擠壓Mg15Al高鋁鎂合金；采用XRD、SEM、EDS和TEM研究不同道次ECAP擠壓后Mg15Al高鋁鎂合金中β-Mg17Al12相的演變。
Mg15Al鎂合金ECAP變形過程中β相的碎化機理及動態析出行為Fragmentation mechanism and dynamic precipitation behavior of?β phase in Mg15Al magnesium alloy during ECAP
為了改善Mg-Al系合金中β-Mg17Al12相的形態、大小和分布，充分發揮其沉淀強化作用，利用能產生強塑性變形的等通道轉角擠壓法擠壓Mg15Al高鋁鎂合金；采用XRD、SEM、EDS和TEM研究不同道次ECAP擠壓后Mg15Al高鋁鎂合金中β-Mg17Al12相的演變。結果表明：ECAP強塑性變形能夠有效地碎化Mg15Al高鋁鎂合金中粗大的網狀共晶β-Mg17Al12相；隨擠壓道次的增加，β-Mg17Al12相尺寸逐漸減小，擠壓4道次后，網狀共晶β-Mg17Al12相被破碎成尺寸在5 μm以下的小塊，分布得到一定改善；由于高應力與高溫的共同作用，擠壓2道次后，部分β-Mg17Al12相發生回溶，擠壓4道次后，在α-Mg基體中動態析出許多尺寸在200 nm以下的粒狀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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