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2024铝合金中的弥散相Al_(20)Cu_2Mn_3普遍由孪晶组成,通过高分辨像的观察分析,发现其孪晶间的界面不是镜面,而是滑移面;孪晶两部分不是反映(或旋转)对称,而是滑移反映对称,“金刚石”滑移面是(101),滑移矢量(1/4)(a-c),组成孪晶的各晶体组元呈棱柱体形状,各侧棱都平行于[010],棱柱侧面是{010}和{100}。

关键词: 孪晶 , glide reflection , high resolution image , Al-Cu-Mg alloy

Effect of Bagasse ash reinforcement on the wear behaviour of Al-Cu-Mg/Bagasse ash particulate composites

V.S. Aigbodion

金属学报(英文版)

The effect of Bagasse ash (BAp) particle reinforcement on the wear behavior of Al-Cu-Mg alloy has been studied. Bagasse ash particles were varied from 0 wt pct-10 wt pct with interval of 2 wt pct. Unlubricated pin-on disc tests were conducted to examine the wear behaviour of the aluminium alloy/Bagasse ash particulate composites. The tests were conducted at varying loads, from 5 to 20 N and sliding speeds of 1.26 m/s, 2.51 m/s , 3.77 m/s and 5.02 m/s for a constant sliding distance of 5000 m. The results showed that the wear rates of the Al-Cu-Mg/BAp composites are lower than that of the matrix alloy and further decrease with increasing Bagasse ash content. Wear rate increases as the sliding speed and applied load increase. The microstructure of the worn surface revealed that a large amount of plastic deformation appeared on the surface of the unreinforced alloy. While Bagasse ash reinforced Al-Cu-Mg alloy showed worn out surface that is not smooth, and grooves, scratches and parallel lines were observed. A combination of adhesion and delamination wear was in operation. These results show that improve wear properties is achievable for the aluminium alloy by the addition of Bagasse ash particles as reinforcement material.

关键词: Al-Cu-Mg alloy

低温球磨粉末冶金制备Al-Cu-Mg合金的微观组织及力学性能

何天兵 , 初德胜 , 唐鹏钧 , 王兴元 , 何晓磊 , 李沛勇 , 胡仁伟

航空材料学报 doi:10.11868/j.issn.1005-5053.2015.6.003

利用快速凝固和低温球磨复合工艺制备Al-Cu-Mg合金粉末,通过冷压、热挤压工艺固结成形,并对其进行固溶和自然时效处理,研究该过程中材料的微观组织变化和力学性能.结果表明:球形Al-Cu-Mg合金雾化粉末球磨4h后全部变为层片状,CuAl2和Al2CuMg相发生分解并回溶入α(Al)基体中形成过饱和固溶体;挤压态材料的组织致密(致密度达98.6％),经热处理后平均晶粒尺寸约900nm,自然时效阶段合金中析出大量弥散分布的GP区和S"相;T4态材料的抗拉强度和屈服强度分别为526MPa和397MPa,而伸长率(15％)仍保持在较高水平,其强化方式主要为细晶强化和沉淀强化.

关键词: Al-Cu-Mg合金 , 快速凝固 , 低温球磨 , 晶粒细化 , 组织性能

Effect of Bagasse ash reinforcement on the wear behaviour of Al-Cu-Mg/Bagasse ash particulate composites

金属学报(英文版)

关键词:

Influence of Mg Contents on Aging Precipitation Behavior of Al-3.5Cu-xMg Alloy

金属学报(英文版) doi:10.1007/s40195-014-0033-7

关键词:

预变形对高纯 Al-Cu-Mg 合金组织和力学性能的影响

李慧中 , 刘若梅 , 梁霄鹏 , 邓敏 , 廖慧娟 , 黄岚

中国有色金属学报(英文版) doi:10.1016/S1003-6326(16)64253-X

通过拉伸测试、硬度测试、扫描电镜以及透射电镜等手段，研究预变形对高纯 Al?Cu?Mg 合金180°C时效后组织和力学性能的影响。结果表明：与未预变形的样品相比，随着预轧制量的增加，预轧制后样品的峰值硬度值逐渐增加，而达到峰值硬度所需的时间也逐渐缩短。此外，在预变形的合金时效过程中观察到双峰硬化现象。TEM 的研究结果表明，经冷轧变形的合金随着预变形量的提高，合金中 S′(Al2CuMg)相的密度增大，尺寸减小，这种高密度、细小的 S′相以及高密度位错是导致合金峰值硬度和强度提高的主要原因。

关键词: Al-Cu-Mg 合金 , 预变形 , 人工时效 , 析出相 , 显微组织 , 力学性能