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of AZ31 Mg alloy (mass fraction, %) 利用D/max 2500型X射线衍射仪(X-ray diffraction, XRD)分析该镁合金板坯的相组成及其晶格常数,实验采用Cu靶,管电压40 kV,管电流250 mA,扫描速度8 (?)/min.对所得的XRD谱,使用MDI Jade 5.0软件进行分析.板坯试样经锯切,镶嵌,研磨和抛光后,用5 mL硝酸+95...XRD分析 图1所示为TRC AZ31镁合金的XRD谱.MDI Jade 5.0软件的分析结果表明,合金的主要相组成为六方结构的α-Mg,各衍射峰所对应的晶面指数如图1所示.除此之外的第二相含量很少,以至于不能从XRD谱中反映出来. 图1 TRC AZ31镁合金的XRD谱 Fig.1 XRD pattern of TRC AZ31 Mg alloy 将TRC......
the second phase are adequately refined by large deformation. Key words: wrought magnesium alloy; AZ31 Mg alloy; rare earth; second phase 稀土元素常被添加到镁合金中提高合金的性 能[1].LIU等[2]研究发现AM60合金中添加Ce和La提高...-Mg的晶界上,具有很好的强化作用,因而使得添加Ce或Nd的AZ31合金的强度明显优于未添加稀土元素AZ31合金的,AZ31热轧板材的抗拉强度由于Ce的添加由270 MPa提高到298 MPa,添加稀土Nd的AZ31合金抗拉强度可以达到303 MPa.但是,郑伟超等[11]在研究混合稀土(富铈混合稀土,主要有稀土Ce,La,Nd)对AZ31B变形镁合金组织和力学性能影响时却发现,稀土的添加导致......
均匀,平均晶粒度约为8.9 ?m；而常规轧制板材的晶粒组织中则存在大量的孪晶,且分布不均匀,其平均晶粒度达13.2 ?m.这主要是在常规轧制和异步轧制过程中,镁合金的变形机理以及这2种轧制方式变形机理差异所决定的. (a) 常规轧制；(b) 异步轧制 图1 AZ31镁合金板材显微组织 Fig.1 Microstructures of AZ31 Mg alloy...验条件下,下辊直径大于上辊直径,因此板材下表面承受的剪切变形也更大.在其他条件相同时,附加的剪切变形使得晶粒更加细小均匀. (a)下表面；(b) 上表面；(c) 横截面 图2 总变形量为40%时AZ31镁合金板材的显微组织 Fig.2 Microstructures of AZ31 Mg alloy sheets at 40% of total thickness......
(a) and typical high angle grain boundaries (HAGBs) image in ECAE Mg AZ31 alloy (b) 镁合金中GBS通常在高温低应变速率下发生.室温变形时,在挤压态镁合金中没有发现明显的晶界滑移,粗晶内位错滑移程大,晶界附近应力集中严重,极易诱发孪晶变形.但在细晶镁合金中,即使在室温和总变形量较小的情况下也可发生明显的GBS,细晶组织不仅位... AZ31 Mg alloy, and the tension-compression asymmetry is weakened; ECAE alloy also exhibits a strain rate sensitivity, and the strain rate sensitivity factor will be increased with increasing......
Trans. Nonferrous Met. Soc. China 25(2015) 3604-3610 Influence of pre-strain and heat treatment on subsequent deformation behavior of extruded AZ31 Mg alloy Hong-bing CHEN1,2, Tian-mo LIU1, Li-wei...: Pre-compression and heat treatment were performed on an extruded AZ31 Mg alloy, and their effects on subsequent deformation behavior were investigated. The results show that at low temperature......
相场方法模拟AZ31镁合金的静态再结晶过程高英俊1,2,3,罗志荣1,胡项英3,黄创高3(1.广西壮族自治区南宁市广西大学物理科学与工程技术学院2.广西壮族自治区南宁市广西大学工程防灾与结构安全重点实验室3.辽宁省沈阳市科学院国际材料物理中心)摘 要:为了获得合金静态再结晶前的变形晶粒组织,应用网格畸变模型与相场模型结合,生成变形合金再结晶前的初始晶粒组织;针对合金不同变形区域的特征和体系储存能分布不均匀的特点,分别引入反映不同变形区域的储存能分布的权重因子和变形区域的特征状态因子,构造多状态的非均匀自由能密度函数.在此基础上,应用相场动力学方程模拟了AZ31镁合金的静态再结晶过程的微结构演化,系统地分析了再结晶转变动力学曲线和Avrami曲线,以及储存能释放规律和再结晶晶粒尺度分布.模拟得到的动力学规律......
by immersion treatment in a simple MPCC solution containing Mg2+ and ions. The MPCC on AZ31 Mg alloy showed micro-cracks structure and a uniform thickness with the thickness of about 2.5 μm after 20... and magnesium hydroxide/oxide compounds. The MPCC showed a significant protective effect on AZ31 Mg alloy. The corrosion current of MPCC was reduced to about 3% of that of the uncoated surface and the time......
Trans. Nonferrous Met. Soc. China 23(2013) 1949-1956 Fatigue behavior of friction stir spot welded AZ31 Mg alloy sheet joints Tian-jiao LUO, Bao-liang SHI, Qi-qiang DUAN, Jun-wei FU, Yuan-sheng YANG... and all fatigue cracks initiate at the tongue-like region. Key words: AZ31 Mg alloy sheet; friction stir spot welding; fatigue; fatigue failure; fatigue crack 1 Introduction Recently, the automobile......
Superplasticity of fine-grained AZ31 Mg alloy sheets YIN De-liang(尹德良), ZHANG Kai-feng(张凯锋),WANG Guo-feng(王国峰), HAN Wen-bo(韩文波) (School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, China) Abstract: Superplastic mechanical properties of fine-grained AZ31 Mg alloy sheets in the temperature range of 250-450℃ and strain rate range of 0.7×10-3-1.4×10-1s-1......
that the dominant deformation mechanism of the samples under WR is twinning. 3.3 Texture of samples Figure 3 shows the (0001), and pole figures of AZ31 Mg alloy sheets produced by warm rolling (WR... and Compounds, 2012, 536: 94-105. [12] XU Z H, TANG G Y, TIAN S Q, DING F, TIAN H Y. Research of electroplastic rolling of AZ31 Mg alloy strip [J]. Journal of Materials Processing Technology, 2007, 182......
