外應力對AZ31鎂合金晶粒長大和織構影響的相場模擬

外應力對AZ31鎂合金晶粒長大和織構影響的相場模擬Effect of applied stress on grain growth and texture in AZ31 magnesium alloy by phase-field simulation

建立了一個模擬外應力作用下AZ31鎂合金在高溫退火過程中晶粒長大和織構演化的三維相場模型。通過3個歐拉角構成的歐拉空間表達晶體學取向，賦予有序化參數以晶體學取向的物理意義。由于鎂合金晶體結構為密排六方結構，不同晶體學方向存在彈性各向異性，根據每個取向晶粒的(0001)面相對于外應力方向的角度旋轉剛度矩陣，得到不同取向晶粒對應的剛度矩陣，從而計算出外應力對不同取向晶粒做的功。結果表明：將模擬結果與已有的實驗結果進行了對比分析，織構模擬結果與實驗觀察到的織構相一致；外應力的增加會使晶粒長大速率加快，當外應力大于600 MPa時，可能會導致晶粒的異常長大；此外，當壓應力大于400 MPa時，AZ31鎂合金中會產生á0001？晶向平行于外應力方向的基面織構。

A 3D phase-field model was established to investigate the effect of applied stress on grain growth and texture evolution in AZ31 magnesium alloy at elevated temperatures. The order parameters were given a physical meaning of lattice orientation of grains represented by three angles in spatial coordinates. The stiffness tensor for different grains was suggested different because of elastic anisotropy of the magnesium lattice by transforming the standard stiffness tensor with different degrees of the (0001) plane angle with respect to the direction of applied stress so that different grains contributed different amounts of work under applied stress. The results reveal that the simulation results are explained using the limited existing experimental data, and the texture results are in good agreement with the experimental observation. The grain-growth rate increases with the applied stress, which may lead to abnormal grain growth when the stress is greater than 600 MPa. Moreover, the applied stress will also result in an intensive texture of the á0001？ axis parallel to the direction of compressive stress when the applied stress is greater than 400 MPa.

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