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alloy caused by SO2-4 in the bath is reduced in presence of F-. Key words: AZ91D magnesium alloy; bath corrosion; electroless nickel plating; nickel sulfate 镁合金是一种应用范围越来越广的轻金属材料. 由于其本身耐...15h来考察镀液各成分对镁合金耐蚀性的影响, 实验结果列于表4. 表4 Mg合金在镀液中的腐蚀速率 Table 4 Corrosion rate of magnesium alloy in electroless nickel bath 从表4可以看出, 1, 5, 6号试样被腐蚀, 2~4号试样无明显腐蚀痕迹. 1) 由1号试样可知......
双螺旋搅拌法制浆工艺参数对AZ91D合金半固态组织的影响 刘国钧1,朱光磊1,张志峰1,徐骏1 (1.北京有色金属研究总院国家有色金属复合材料工程技术研究中心,北京,100088) 摘要:双螺旋搅拌工艺制备了AZ91D合金半固态浆料,获得金属半固态加工要求的细小,等轴分布均匀的非枝晶组织.研究了熔体温度,搅拌速度和剪切时间对该组织的影响规律.结果表明:采用合适的搅拌工艺,可获得金属半固态加工要求的细小,等轴分布均匀的非枝晶组织.即降低降体温度,搅拌速度及适当剪切时间有利于细小球形晶粒的形成.加大搅拌速度及合理搅拌时间可以细化晶粒,主要是由于是高剪切作用下熔体获得一个非常均匀温度场,从而增加有效形核的缘故. 关键词:AZ91D镁合金; 半固态; 搅拌工艺; AZ91D Mg alloy; semisolid; stirring process; [全文内容正在添加中] ......
. Plasma electrolysis for surface engineering [J]. Surface and Coatings Technology, 1999, 122(2-3): 73-93. [7] WANG Shu-yan, XIA Yong-ping. Microarc oxidation coating fabricated on AZ91D Mg alloy...Trans. Nonferrous Met. Soc. China 25(2015) 1500-1505 Effect of current frequency on properties of coating formed by microarc oxidation on AZ91D magnesium alloy Bin ZOU1, Guo-hua 2, Gu-ling ZHANG1, Yu......
-ling. Formation mechanism of pulse current anodized film on AZ91D Mg alloy [J]. Transactions of Nonferrous Metals Society of China, 2008, 18: 19-23. [9] TIMOSHENKO A V, MAGUROVA Y V. Investigation...-wave and full-wave power source on the anodic oxidation process on AZ91D magnesium alloy [J]. Appl Surf Sci, 2009, 255: 5721-5728. 交变方波电源参数对镁合金AZ91D微弧氧化的影响 常林荣1, 曹发和1, 蔡景顺1, 刘文娟1, 张 昭1, 张鉴清1, 2 1. 浙江大......
就可能使后续较小的应力幅值循环下的棘轮应变率明显下降.具体原因需进一步研究. 图2 幅值应力控制条件下AZ91D镁合金的σ-εr曲线和 εr-N曲线 Fig.2 Curves of σ-εr and εr-N (b) for AZ91D magnesium alloy under stress cycling at different stress amplitudes 图3所示为AZ91D镁合金的饱和棘轮应变-幅值应力曲线.由图3可知,随着幅值应力的增大,饱和棘轮应变增大.同时可以发现应变的增幅越来越大,即随着幅值应力增大,棘轮应变率水平随之增大. 图3 AZ91D镁合金的εr-σa曲线 Fig.3 Curves of εr-σa for AZ91D magnesium alloy 2.2 不同平......
microstructure of AZ91D alloy is shown in Fig. 1. The cast structure consisted of dominant α-Mg and an amount of β-Mg17Al12 phases along the grain boundaries, and the average grain size was determined...Trans. Nonferrous Met. Soc. China 24(2014) 1683-1689 Dynamic recrystallization kinetics of as-cast AZ91D alloy Yan XU1, 2, Lian-xi HU1, Yu SUN1 1. School of Materials Science and Engineering, Harbin......
coating could yield on Mg alloy surface in 2 h. Corrosion rate (corrosion current density, Jcorr) of the Mg,Al-hydrotalcite-coated sample and CaCO3-coated AZ91D sample was 7-10 μA/cm2, roughly two orders..., respectively. Key words: Mg alloy; AZ91D alloy; corrosion; conversion coating; carbonic acid ......
, DONG Wen-chao, LIU Jin-wei. Preparation of semisolid slurry of AZ91D Mg alloy[J]. Special Casting and Nonferrous Alloys, 2004(5):12?14. (In Chinese). [12]GUO Hong-min,YANG Xiang-jie, LUO Xue-quan...: Taking AZ91D magnesium alloy as experimental material, the rheo-diecasting process was implemented by combining the self-developed taper barrel rheomoulding(TBR) machine with high pressure die......
properties of rheomoulding AZ91D alloy were investigated. The results show that the process can obtain such rheomoulding AZ91D in which primary α-Mg particles are fine, spherical and uniformly... strength and elongation are increased by 27.8%, 15.7% and 121%, respectively. Key words: AZ91D alloy; rheomoulding; pouring temperature; cylinder temperature; mechanical properties 1 Introduction Mg alloy......
, XU J. Microstructure and mechanical properties of rheo-diecasting AZ91D Mg alloy [J]. Transactions of Nonferrous Metals Society of China,2010, 20(S3): s862-s867. [10] CHEN Z Z. Preparation of semi...Trans. Nonferrous Met. Soc. China 22(2012) 2906-2912 Microstructure evolution of hot pressed AZ91D alloy chips reheated to semi-solid state XU Hong-yu, JI Ze-sheng, HU Mao-liang, WANG Zhen-yu School......
