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400030, China Received 22 July 2013; accepted 19 October 2013 Abstract: The effects of the addition of 0.6% Ca (mass fraction) on the as-cast microstructure and mechanical properties... tests. The results indicate that the addition of 0.6% Ca to the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys can refine the grains of the two alloys. At the same time, the addition of 0.6% Ca......
AZ61连铸锭具有晶粒细小,析出相弥散分布的均匀组织；电磁场和钙微合金化均能提高变形镁合金AZ61的抗拉强度,合金的最大抗拉强度值达到259.4MPa,较直冷连铸AZ61镁合金的提高24.2%；但钙微合金化不利于提高AZ61镁合金的伸长率. 关键词:AZ61镁合金；电磁场；微合金化；Ca 中图分类号:TG146.2 文献标识码...AZC6101的电磁连铸过程中,合金中的Ca和Mg与O2形成致密的CaO/MgO复合保护壳层,从而有效地抑制铸锭中氧化夹杂的产生,合金铸锭的质量得到大大提高.由此可见,通过对变形镁合金AZ61 施加中频电磁场和钙微合金化有助于改善镁合金的表面质量,得到表面光滑,无氧化夹杂和偏析瘤的高质量变形镁合金铸锭. 2.2 变形镁合金铸态微观组织 在不同条件下得到的变形镁合金连铸锭的微观组织如图3所示......
而不燃烧. SEM和XRD分析表明: 合金表面生成了主要由氧化钙和氧化镁组成的复杂氧化膜, 氧化膜内侧组织主要是Mg2Ca, 该氧化膜具有保护性, 但薄厚不一, 极不规则. 高温氧化动力学研究显示: 该合金在673K和873K氧化符合抛物线规律, 而在773K氧化遵循立方规律. 热力学计算结果表明: 在Mg-2.5Ca合金中从室温到1143K温度范围内Ca都比镁优先与氧结合生成CaO, 当Ca含量...-proof magnesium alloy was improved by the addition of calcium. When the content of Ca is larger than 1.7%, the alloy Mg-2.5Ca can avoid from ignition at 1173K for 30min. XRD and SEM analyses of oxide......
; Abstract: The effects of Ca addition on the as-cast microstructure and mechanical properties of the Mg-5Zn-5Sn (mass fraction, %) alloy were investigated. The results indicate that an addition... thermal stability; an increase in Ca amount from 0.5% to 1.5% (mass fraction) increases the amount and size of the CaMgSn phase. In addition, Ca addition to the Mg-5Zn-5Sn alloy improves not only......
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Trans. Nonferrous Met. Soc. China 30(2020) 647-656 Influence of trace Ca addition on texture and stretch formability of AM50 magnesium alloy sheet Hong-liang ZHAO1, Yun-xiao HUA1, Xiang-lei DONG1... the effect of trace Ca addition on the texture and stretch formability of AM50 alloy. The results show that the addition of trace Ca can effectively modify the basal texture, which is characterized......
Trans. Nonferrous Met. Soc. China 29(2019) 2056-2065 Effect of Ca addition on microstructure and impression creep behavior of cast AZ61 magnesium alloy B. NAMI, S. M. MIRESMAEILI, F. JAMSHIDI, I... of AZ61 alloy are improved with the Ca addition. The improvement in creep properties is attributed to the reduction in the amount of Mg17Al12 phase and the formation of (Mg,Al)2Ca phase with high......
: Mg sheets; hot rolling; dynamic recrystallization; Ca addition; texture weakening 1 Introduction Mg rolled sheets, which have the potential for the manufacture of complex parts with thin-walled... grains appear to have nucleated in the vicinity of precipitates. A comparative analysis from the above EBSD maps illustrates that it is the addition of Ca that results in the formation of finer grains......
; 文献标识码: A Influence of Ca addition on microstructure... investigated by opitical microscope, environmental scanning electron microscope, tensile test machine, etc. It is found that with the increasing Ca addition in composites, Mg2Si is transformed from......
Ca(OH)2-菱镁矿混合粉体轻烧热分解进程及其对合成镁钙砂烧结性能的影响赵现堂,柯昌明,张锦化,王景然,倪月娥武汉科技大学省部共建耐火材料与冶金国家重点实验室摘 要:为了在不降低镁钙高温性能的同时改善合成镁钙砂的烧结性能,以辽宁大石桥菱镁矿细粉(≤0.075 mm),化学纯Ca O为原料,经湿磨消化,轻烧(分别于650和900℃保温40 min),成型,不同温度煅烧(1 400,1 500,1 600和1 650℃保温3 h),研究了Ca(OH)2-菱镁矿混合粉体的轻烧热分解进程及其对合成镁钙砂烧结性能的影响.结果表明,Ca(OH)2的"分解-碳酸化-再分解"反应对混合粉体的热分解进程,轻烧粉体的结构及烧结性能有重要影响;Ca(OH)2的引入可明显降低菱镁矿分解温度,防止轻烧粉体中"母盐假象"的形成......
