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Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Cast AZ31 Magnesium Alloy
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Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Cast AZ31 Magnesium Alloy
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National Natural Science Foundation of China (51074119) and Xi’an Science and Technology Project (CXY1124(4))

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    摘要:

    對鑄態(tài)AZ31鎂合金進(jìn)行單道次和雙道次攪拌摩擦加工，對其微觀組織和力學(xué)性能進(jìn)行研究。結(jié)果表明：鑄態(tài)AZ31鎂合金攪拌摩擦加工后，共晶網(wǎng)狀β-Mg17Al12相破碎并發(fā)生固溶，微觀組織顯著細(xì)化和均勻化。AZ31鎂合金母材和單道次攪拌摩擦加工后的試樣沒有擇優(yōu)取向，而雙道次攪拌摩擦加工后的試樣存在擇優(yōu)取向，其（0002）基平面與試樣表面平行。單道次和雙道次攪拌摩擦加工后試樣的抗拉強度分別提高了43和82 MPa，延伸率提高了4.3%和11.9%。攪拌摩擦加工后試樣的拉伸斷口表現(xiàn)為韌性斷裂特征。

    Abstract:

    Cast AZ31 magnesium alloy was treated by the single-pass and two-pass friction stir processing (FSP), respectively, and the microstructure and mechanical properties were investigated. The results show that FSP causes a remarkable grain refinement and homogenization, and it makes the coarse, network-like eutectic β-Mg17Al12 phase break up and dissolve into the magnesium matrix. There is no obvious preferential orientation in the cast AZ31 alloy and the single-pass FSP specimen. On the contrary, the two-pass FSP specimen exhibits the preferential grain orientation, and (0002) basal plane shows a strong tendency to be parallel to the plate surface. Further, the ultimate tensile strengths of the single-pass and the two-pass FSP specimens increase by 43 and 82 MPa, and elongations increase by 4.3% and 11.9%, respectively. In the FSP condition, the fracture surface of the AZ31 magnesium alloy exhibits ductile fracture characterization.

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王 文,王快社,郭 強,吳 楠. Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Cast AZ31 Magnesium Alloy[J].稀有金屬材料與工程,2012,41(9):1522~1526.[Wang Wen, Wang Kuaishe, Guo Qiang, Wu Nan. Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Cast AZ31 Magnesium Alloy[J]. Rare Metal Materials and Engineering,2012,41(9):1522~1526.]
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  • 收稿日期:2011-09-11
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