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. 关键词: 镁钙合金; Mg2Ca; CaMgSi; Mg2Si; 力学性能 中图分类号: TG113.12; TG146.2+2 文献标识码: A Microstructure and mechanical properties of magnesium alloys containing Ca and Si AI Yan-ling, LUO Cheng-ping, LIU...-like (needle like) Mg2Si compounds are formed in addition to the CaMgSi ones. After solution-ageing treatment, the divorced eutectic (Mg+Mg2Ca) along the grain boundaries of Mg-Ca alloy containing only......
on microstructure, mechanical properties and corrosion resistance of magnesium alloy was studied. When the addition of Ca is more than 1%, the β phase decreases and some reticular Al2Ca phases form on grain boundaries. The tensile tests indicate that when the Ca addition is less than 1%, the ultimate strength and elongation of AZ91D alloy increase, but when the Ca addition is more than 1%, the strength......
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Mg-Li ALLOY WITH Ca ADDITION H.B. Ji1,H.J. Yu1,Z.Q. Guo1,H.B. Li1,Y.H. Liu1,G.C. Yao1 (1.School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China) Abstract:Mg-9wt%Li-2wt%Zn alloy was prepared and studied in this article. The addition of Ca to the alloy from 0.1wt% to 1wt% can refine the α-Mg and the best effect of refinement......
的问题. 在AZ91D镁合金熔体中添加少量的钙元素可显著降低其氧化倾向,改善组织致密性,热处理敏感性和耐高温性能,但是添加的钙元素超过一定量时会大大增加合金产生脆性和热裂的倾向[9?10].先前的工作分析了在AZ91D镁合金中添加少量钙(0≤w(Ca)≤1.0%)对晶粒尺寸,晶界组织,热裂及力学性能的影响,即随着钙添加量的增大,合金的晶粒及晶界组织细化趋势较为明显,其作用机制与新相Al2Ca...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......
钙钛矿氧化物La0.65(Ca,Ba)0.35Mn1-xFexOy的磁电阻效应 刘宜华1,付刚1,赵文瑾1,丁志强1,梅良模1,张清泉1,胡季帆1 (1.山东大学物理系,山东,济南,250100) 摘要:本工作制备了La0.65(Ca,Ba)0.35Mn1-xFexOy(x=0~0.2)氧化物系列样品.发现在常温附近,含Ba样品的磁阻变化率远比相应含Ca样品的高.在x=0时,样品电阻随温度的变化曲线存在金属-半导体转换峰,随着Fe对Mn的部分替代,该转换峰向低温区移动,当替代量x达到一定程度时,在实验温区观察不到金属-半导体转换峰.磁阻效应在高铁含量时只能在低温观察到.Fe替代Mn对大磁阻效应的影响,可能主要因为:随着Mn3+被Fe3+所替代,样品La0.65(Ca,Ba)0.35Mn1-xFexOy中的铁磁相互作用受到抑制,反铁磁相互作用得到加强. 关键词:CMR材料; La......
properties increase. Compared to conventional casting, the AZ91-1Ce alloy with the addition of 2 wt.% Ca by rheo-squeeze casting not only guarantees the oxidation resistance (801 °C), but also... addition. Considering the high price of Ce element, 1% Ce is added to AZ91 alloy in this work [8,9]. However, the high addition of Ca content decreases the ultimate tensile strength (UTS) and elongation......
3104铝合金熔体中Ca的来源分析及其除钙方法刘民章,张能发,潘建业青海桥头铝电股份有限公司摘 要:分析计算了3104铝合金中碱土金属元素Ca的主要来源,确定了保温炉内铝液精炼时所采用的除钠剂,打渣剂和覆盖剂中的Ca是铝熔体Ca含量高的主要原因,认为熔剂精炼不能满足高品质3104罐料对Ca含量的要求,采用以高纯氩气为载体向铝熔体中通入四氯化碳并进行二次精炼是确保熔体中低Na,Ca含量的有效方法.关键词:3104合金;铝熔体;钙;来源;除钙;......
Trans. Nonferrous Met. Soc. China 22(2012) 2984-2990 Synthesis of (Ca, Mg)-α′-Sialon-AlN-BN powders from boron-rich blast furnace slag by microwave carbothermal reduction-nitridation JIANG Tao1, 2, 3... April 2012; accepted 3 July 2012 Abstract: (Ca, Mg)-α′-Sialon-AlN-BN powders were synthesized by the carbothermal reduction and nitridation (CRN) method using boron-rich slag, one of the intermediate......
(mass faction) and Ca were studied using SEM, EDS and XRD. It is found that combining addition of 0.7%TiB2 and 0.1%Ca to AZ91D magnesium alloy leads to the α-Mg grain size decreasing from 240 to 46 μm...文章编号:1004-0609(2011)01-0051-07 Mg-TiB2中间合金和Ca对AZ91D镁合金组织和性能的影响 韩 辉, 陈 阳, 刘生发, 陈 欣 (武汉理工大学 材料科学与工程学院,武汉 430070) 摘 要:采用SEM,EDS和XRD等测试手段,研究Mg-50%TiB2(质量分数)中间合金和碱土金属元素Ca对AZ91D镁合金组织和性能的影响.结果表明......
was modified by combining Ca addition with carbon inoculation. The effects of Fe addition and addition sequence on the grain refinement were investigated. A higher grain refining efficiency could be obtained for the Mg-Al alloy modified by combining Ca addition with carbon inoculation. Fe addition and addition sequence had no obvious effect on the grain refinement. Ca addition could effectively avoid......
