共搜索到90481条信息,每页显示10条信息,共9049页。用时:0小时0分0秒546毫秒
粒细化剂和变质剂.在不含铝的镁合金中添加Zr可以细化晶粒,然而,对于含Al,Si,Mn,Ni,Fe的镁合金,Zr则不能细化[2].对于Mg-Al合金,过热或加入碳变质剂均可以起到细化效果[3].然而,过热容易导致氧化,加入碳变质剂则会引入含碳化合物.迄今,还没有用于Mg-Al系镁合金的理想变质剂[4].另外,稀土元素(RE) 可以有效细化镁合金[5-8],然而,高昂的价格使得应用稀土元素细化受到限...-Mg under LVPMF was developed by analyzing the growth behavior of α-Mg dendrite. Key words: Mg alloy; microstructure; grain refinement; pulsed magnetic field 镁合金作为最轻的金属结构材料,具有较高的比强度,比刚度和良好的导热,减震,电磁屏蔽等......
. The AZ91 magnesium alloy has a nominal composition as Al 9% (mass fraction), Zn 1% (mass fraction) and Mg balance. Alloy samples with dimensions of 1 cm × 1 cm × 1 cm were mounted in polyester...Trans. Nonferrous Met. Soc. China 23(2013) 2577-2584 Corrosion protection of AZ91 magnesium alloy in cooling systems D. SEIFZADEH, H. BASHARNAVAZ Physical Chemistry Research Laboratory, Applied......
reveals that they contain Al and Ca elements, and the chemical compositions of the lamellas are approximately 14.4%Al, 2.3%Ca and Mg balance. Fig.3(a) shows the XRD pattern of AZ91+0.5Ca alloy... of extruded AZ91+XCa alloy tubes were investigated. The microstructural observation indicates that Ca can obviously refine both α-Mg grains and Mg17Al12 phase of AZ91 magnesium alloy. XRD analysis shows......
Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron BeamPeng-Peng Wu,Kun-Kun Deng,Kai-Bo Nie,Zhong-Zhong ZhangShanxi Key Laboratory of Advanced Magnesium-Based Materials... 6 J/cm2 was applied on AZ91 Mg alloy to improve its corrosion resistance. Results showed that the net-like Mg17Al12 disappeared on the surface of AZ91 Mg alloy after irradiation by HCPEB, which......
Influence of Mg Addition on Graphite Particle Distribution in the Al Alloy Matrix CompositesZhengang Liu,Guoyin Zu,Hongjie Luo,Yihan Liu and Guangchun Yao School of Materials & Metallurgy,Northeastern University,Shenyang 110004,China摘 要:Al alloy matrix composites reinforced with copper-coated graphite particle have been prepared by melt stirring......
了稀土(0.1%~1.2%)对AZ31B变形镁合金组织和力学性能的影响. 结果表明: 在AZ31B变形镁合金中添加稀土后, 晶粒显著粗化, 合金的室温力学性能下降. 晶粒粗化一方面是由于RE与Al结合生成了Al11RE3相, 消耗了一部分铝量, 削弱了铝对α-Mg晶粒的细化作用; 另一方面RE与ε-AlMn相反应生成Al-RE-Mn相, 使得合金熔体中的异质形核核心减少; 稀土引起AZ31B变形镁... Fig.2 Effects of RE additions on average grain size of AZ31B magnesium alloy 稀土引起AZ31B镁合金晶粒粗化的原因是由于: 首先, 当往AZ31B镁合金中添加稀土时, 由于RE与Al的电负性差值(0.4)大于其与Mg的电负性差值(0.1)[18], RE优先与Al结合生成Al-RE相. 图4所示为AZ31B镁合金添......
in Fig.1. It can be known that the main phases in AZ31 alloy are α-Mg and the others that depict like particles or short rods are secondary phases, Mg17Al12 and Al-Mn phases distribute in the Mg solid... of Mg alloys is much more significant than that of Al. As a result of dynamic recrystallization, fine grains are obtained in AZ31 alloy after extruding, which results in the improvement of mechanical......
真空熔炼AZ91镁合金过程中Mg元素的蒸发行为 李明照1,张金玲1,卫英慧1,许并社1,张俊远1,王社斌1 (1.太原理工大学,山西,太原,030024) 摘要:在真空Ar气氛中熔炼AZ91镁合金,测定了不同精炼温度下Mg元素的蒸发速率.结果表明,随着精炼温度的升高,Mg元素的蒸发量增大.通过计算可知,Mg的蒸气压是Al的109倍,是Zn的46倍,因此主要是Mg的蒸发而导致合金其他元素含量升高.XRD分析表明,蒸发物是Mg元素.结合Mg元素的蒸发机制,在该试验条件下推导出Mg元素蒸发率的计算公式以及Mg元素的表观传质系数,蒸发率与精炼温度的关系,计算得出Mg元素蒸发率为0.86×10-3~1.35×10-3 g/cm2·s,Mg元素的表观传质系数在2×10-5~24×10-5 cm/s范围内. 关键词:AZ91镁合金; 真空熔炼; 蒸发; [全文内容正在添加中] ......
实验 配料采用99.99%工业纯铝,99.80%电解铜板,99.90%纯Mg,及工业纯Si,在高纯石墨坩埚电阻炉中熔配出Al-Cu,Al-Si中间合金,再加入上述纯金属配出所需成分,3种实验合金成分分别为:合金A,Al-5.17Cu-2.63Si(质量分数,下同);合金B,Al-4.29Cu- 1.09Mg;合金C,Al-2.09Si-1.66Mg. 为使同成分合金在3种差别较大的冷却速度...;Positions of investigated alloys on isothermal section at heat treatment temperature: (a) Al-Cu-Si alloy, 490 ℃; (b) Al-Cu-Mg, 480 ℃; (c) Al-Si-Mg, 535 ℃ 4 结论 1) 冷却速率对凝固组织影响明显,随着冷却速率的降低,二次枝晶间距增大.合金......
......