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渗铝所得的渗层.根据渗层中的Mg与Al的摩尔比,结合镁铝二元相图[9],可以推断渗层外层主要为Mg2Al3,内层为Mg17Al12. 图2 AZ91D镁合金冶金扩散渗铝层的截面SEM像 Fig.2 Cross-sectional SEM images of diffusion Al-alloyed layer on surface of AZ91D Mg alloy... of AZ91D Mg alloy before and after diffusion Al-alloyed treatment in 3.5% NaCl solution 图6所示为经冶金扩散处理前,后AZ91D样品在3.5 % NaCl溶液中的极化曲线.经冶金扩散处理 后,AZ91D镁合金样品的自腐蚀电位从未处理前的-1.52 V大幅上升至-1.32 V,这是由于镁铝金属间化合物的自腐蚀电......
因数,涂层合金的表面变形能力提高,该阶段质量磨损速率随载荷增加,趋势变得缓慢. 关键词:AZ91D镁合金；微弧氧化；陶瓷涂层；摩擦磨损 中图分类号:TG 115.221.5; TH 117.3 文献标识码: A Dry sliding wear behavior of AZ91D Mg alloy... pattern (b) of coating on AZ91D Mg alloy produced by MAO 2.2 微弧氧化涂层合金的磨损规律 图2所示为涂层合金磨损质量损失率随载荷的变化.由图2可看出,在固定的滑动速率下,施加载荷越大,涂层AZ91D镁合金的磨损速率越大.AZ91D镁合金的密度为1.8 g/mm3,硅酸镁陶瓷密度为2.0~2.5 g/mm3,两者差距不大.考虑到难......
results. Key words: extruded AZ91D Mg alloy; dynamic compression experiment; constitutive behavior; numerical simulation 镁合金由于具有密度低,比强度高,比弹性模量大,散热好,消震性好等优点而被广泛应用于航空航天,汽车,化工等领域[1-3].AZ91D镁合金是目前工业上应用最广泛的镁合... with the experimental and fitted stress-strain responses. The results show that the strain rate sensitivity of the extruded AZ91D Mg alloy increases with increasing the strain rate from 400 s-1 to 1000 s-1......
machining and four kinds of recycled specimens at different extruding temperatures. The commercial AZ91D magnesium alloy microstructure consists of α-Mg solid solution and β-Mg17Al12 phase, shown...Trans. Nonferrous Met. Soc. China 22(2012) s68-s73 Solid-state recycling of AZ91D magnesium alloy chips HU Mao-liang1, 2, JI Ze-sheng1, CHEN Xiao-yu1, WANG Qu-dong2, DING Wen-jiang2 1. School......
resistance. Key words: AZ91D Mg alloy; permanent mould casting; micro-arc oxidation; current density; corrosion resistance; wear resistance ...文章编号:1004-0609(2008)09-1590-06 AZ91D镁合金恒定小电流密度微弧氧化工艺 吕维玲1,陈体军1,马 颖1,徐卫军1, 2,王 伟1,郝 远1 (1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室,兰州 730050； 2. 甘肃联合大学 理工学院,兰州 730000) 摘 要:研究硅酸盐体系中......
表2 AZ91D镁合金表面腐蚀产物的EDXS结果 Table 2 EDXS results of corrosion products on surface of AZ91D magnesium alloy (mass fraction, %) 采用XRD分析镁合金表面的腐蚀产物结果见图9. 在纯空气中主要腐蚀产物为: MgO, Mg-(OH)2, Al(OH)3; 而在含SO2工业污染大气环境中, 主要产物有MgO, Mg(OH)2, MgSO3·6H2O和MgSO4·6H2O. 图6 在含5mg/m3 SO2大气环境中AZ91D镁合金表面形貌的变化 Fig.6 Morphologies of AZ91D magnesium alloy for accelerated test with 5mg/m3 SO2 3 分析和讨论 镁合金在工程中的应用受到限制......
: AZ91D magnesium alloy; solid-state recycling; hot extrusion; mechanical properties 镁合金作为轻质结构材料由于具有密度小, 比强度和比刚度高, 导热和导电性能好, 切削加工性能好, 优良的阻尼性和电磁屏蔽性等优点, 在航空航天, 汽车, 电子, 通讯等方面获得了广泛的应用. 尽管如此, 由...锋, 等. 热挤压AZ91D 镁合金的组织与力学性能[J]. 西安理工大学学报, 2005, 21(4): 356-360. XU Chun-jie, ZHANG Zhong-ming, GUO Xue-feng, et al. Microstructure and mechanical properties of extruded AZ91D alloy[J]. Journal of Xi......
alloy Figure 4 shows the optical microstructure of AZ91D billet. The as-cast microstructure is composed of primary α-Mg matrix and β-Mg17Al12 phase [19]. The eutectic phase precipitated as discontinuous... of Technology, 2005: 117-118. (in Chinese) [26] DU X H, ZHANG E L. Microstructure and mechanical behaviour of semi-solid die-casting AZ91D magnesium alloy [J]. Materials Letters, 2007, 61: 2333-2337. 循环镦挤在AZ91D镁合......
): 4058-4063. [6] TURHAN M C, LYNCH R, KILLIAN M S, VIRTANEN S. Effect of acidic etching and fluoride treatment on corrosion performance in Mg alloy AZ91D (Mg-Al-Zn) [J]. Electrochimica Acta, 2009, 55(1... pretreatment on AZ91D magnesium alloy [J]. Materials Chemistry and Physics, 2010, 121(1-2): 308-313. [16] YANG H Y, CHEN X B, GUO X W, WU G H, DING W J, BIRBILIS N. Coating pretreatment for Mg alloy......
金,其化学成分如 表１所示；钙元素以中间合金Mg-30% Ca的形式加入到合金熔体. 表1 AZ91D镁合金的化学成分 Table 1 Chemical composition of AZ91D magnesium alloy (mass fraction, %) 在镁合金熔化保温电阻炉中进行熔炼,坩埚升温至400 ℃,放置镁合金,通入保... Fig.1 Curves of melt viscosity versus temperature with different calcium additions of AZ91D magnesium alloy: (a) 0%; (b) 0.4%; (c) 0.8%; (d) 1.0% 未添加钙元素时,AZ91D镁合金熔体的黏度随温度的升高而降低,曲线υ(t)接近730 ℃时......
