【摘要】：對鑄態(tài)AZ91鎂合金板進(jìn)行了三種不同冷卻條件下的多道次攪拌摩擦加工,即兩次空氣、一次空氣和一次水下、兩次水下的攪拌摩擦加工,并對其組織和力學(xué)性能進(jìn)行了研究。研究結(jié)果表明:在多道次攪拌摩擦加工過程中,劇烈的塑性變形使攪拌區(qū)內(nèi)呈網(wǎng)狀的第二相β-Mg17Al12顯著破碎變成細(xì)小顆粒狀,攪拌區(qū)的微觀組織均得到了顯著細(xì)化,三種不同冷卻條件下樣品的平均晶粒尺寸分別為5.8μm,1.4μm和0.8~1μm;兩次水下加工的組織更為細(xì)小,其顯微硬度、抗拉強(qiáng)度和延伸率較其他兩種冷卻條件下多道次攪拌摩擦加工樣品的高,分別為94.7 HV,355.5 MPa和31.5%。
[Abstract]:In this paper, as cast AZ91 magnesium alloy plates were processed by friction stir under three different cooling conditions, namely, two air, one underwater and two underwater friction stir, and the microstructure and mechanical properties were studied. The results show that during the multi-pass friction stir process, the second phase 尾-Mg17Al12, which is reticulated, is broken into fine particles, and the microstructure of the stir zone is refined by the severe plastic deformation, and the results are as follows: (1) during the process of multi-pass friction stir processing, the second phase 尾-Mg17Al12 in the stirring zone is obviously broken into fine particles. The average grain sizes of the samples under three different cooling conditions are 5.8 渭 m, 1.4 渭 m and 0.8 渭 m, respectively. The microhardness, tensile strength and elongation of the two processes were higher than those of the other two kinds of cooling conditions (94.7 HV,355.5 MPa and 31.5 HV,355.5 MPa, respectively).
【作者單位】： 華南理工大學(xué)國家金屬材料近凈成形工程技術(shù)研究中心;
【基金】：中央高�；鹂蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(20142G0028)
【分類號】：TG146.22

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