軋制變形對噴射沉積含Nd鎂合金織構及LPSO相的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-04-20
采用噴射沉積技術制備Mg-9Al-3Zn-1Mn-6Ca-2Nd合金沉積坯, 對其進行擠壓預變形和軋制變形(溫度T= 350 ℃; 道次壓下率 ε=20%, 25%, 30%). 利用SEM, TEM 和 XRD研究二次變形對尺寸不對稱擠壓坯中織構演變及LPSO相形成的影響.
軋制變形對噴射沉積含Nd鎂合金織構及LPSO相的影響EFFECTS OF ROLLING DEFORMATION ON TEXTURE AND LPSO?PHASE OF SPRAY-DEPOSITED MAGNESIUM ALLOYS CONTAINING Nd采用噴射沉積技術制備 Mg-9Al-3Zn-1Mn-6Ca-2Nd 合金沉積坯, 對其進行擠壓預變形和軋制變形(溫度 T= 350 ℃; 道次壓下率 ε=20%,?25%, 30%). 利用 SEM, TEM 和 XRD研究二次變形對尺寸不對稱擠壓坯中織構演變及 LPSO相形成的影響. 結果表明: 鎂合金板坯經 350 ℃和道次壓下率為 20%軋制后, 在(Ca, Nd)Al2結構 C15 型 Laves 相基體形成 24R 結構 Mg-Nd-Zn 型 LPSO 相; 隨著軋制變形程度(ε=20%, 25%, 30%)增大實現了形變織構的隨機化, 納米級 C15 粒子釘扎位錯與亞晶引起的再結晶共同作用是導致基面織構(0002), 柱面織構{101-0}<0001>及錐面織構{101-2}全面啟動的主要原因.?
Mg alloys have been applied widely as structural materials over the past decades, with low?density, high specific strength, stiffness, specific elastic modulus, and high recycling rate. However, their features?of poor ductility and formability at room temperature have limited their application due to hexagonal close-packed?crystal structure with less independent slip systems. Grain refinement and texture randomization are two means to?activate other slip systems. In this work, the billets of Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy produced by spraying?deposition method (the Osprey process) were studied in order to analyze the effect of rolling deformation at 350 ℃?and pass reduction ε=20%, 25% and 30% on texture and microstructure evolution of an extruded size-asymmetry?Mg alloy by SEM, TEM and XRD. The results show that under the condition of reduction of ε=20% at 350 ℃, a?long-period stacking ordered phase with 24R structure was formed in (Ca, Nd)Al2 phase (C15 Laves phase ). All?of basal texture (0002), prismatic texture{101-0}<0001>, and pyramidal texture {101-2} were activated, with pole?density level weakened while pass reduction increased(ε=20%, 25% and 30%), namely, texture randomization?achieved in Mg alloy, with main causes of nanometer-sized dispersed C15 phase impeding dislocation movement and?sub-cells inducing the process of recrystallization.?
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