Low temperature mechanical property of AZ91D magnesium alloy fabricated by solid recycling process from recycled scraps  

固相再生AZ91D镁合金边角料的低温力学性能(英文)

作　　者：李冬华[1] 胡茂良[2,3] 王海波[1] 赵望安[1] 

机构地区：[1]哈尔滨理工大学建筑工程学院,哈尔滨150080 [2]哈尔滨理工大学材料科学与工程学院,哈尔滨150040 [3]上海交通大学轻合金精密成型国家工程研究中心,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第6期1234-1240,共7页中国有色金属学报（英文版）

基　　金：Projects(50674038,50974048)supported by the National Natural Science Foundation of China;Project(200802140004)supported by Doctoral Fund of Ministry of Education of China

摘　　要：Low temperature mechanical properties of AZ91D magnesium alloy fabricated by solid recycling process from recycled scraps were studied. Various microstructural analyses were performed using optical microscopy （OM） and scanning electron microscopy （SEM）. The recycled specimens consist of fine grains due to dynamic recrystallization and the interfaces of original individual scraps are not identified. Tensile tests were performed at a strain rate of 5 x 10 3 s 1 at room temperature （27 ~C）, -70, -100 and 130 ~C, respectively. Ultimate tensile strength of the specimens increases slightly with decreasing the tensile temperature, and elongation to failure decreases with decreasing the tensile temperature. The tensile specimens at -130 ~C show the highest ultimate tensile strength of 360.65 MPa and the lowest elongation to failure of 5.46%. Impact tests were performed at room temperature （27 ~C）, -70 and -130 ~C, respectively. Impact toughness decreases with decreasing the impact temperature. The impact specimens at -130 ~C show the lowest impact toughness of 3.06 J/cm2.采用固相再生方法回收AZ91D镁合金边角料,研究再生合金的低温力学性能、微观组织和断口形貌。在WDW-3100型微机控制电子万能试验机上进行低温拉伸实验,实验温度为27,-70,-100和-130℃;在JB30A型冲击试验机上进行冲击实验,温度分别为27,(-70±5)和(-130±5)℃。结果表明:再生合金在固相再生过程中发生了动态再结晶,块与块之间结合较好,原始的块与块之间的界面已经不能分辨。再生合金随着温度的降低,抗拉强度略有增加,伸长率呈下降趋势,即温度降低脆性倾向增加,在-130℃时拉伸,抗拉强度和伸长率分别为360.65MPa和5.46%;随着冲击温度的降低,再生合金的冲击功随之降低,在-130℃时冲击功为3.06J/cm2。

关 键 词：AZ91D magnesium alloy solid recycling process mechanical property impact toughness 

分 类 号：TG146.22[一般工业技术—材料科学与工程]