2E12铝合金微观组织与性能的新型热机械处理调控机理研究（英文）  

Regulation Mechanism of Novel Thermomechanical Treatment for Microstructure and Properties of 2E12 Aluminum Alloy

作　　者：陈志国[1,2] 任杰克[1] 张纪帅[1] 陈继强[1] 黄裕金[1] 方亮[1] 

机构地区：[1]中南大学,湖南长沙410083 [2]湖南人文科技学院,湖南娄底417000

出　　处：《稀有金属材料与工程》2015年第10期2341-2346,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(50871123);Australia-China Special Fund(51011120052)

摘　　要：采用拉伸试验与疲劳裂纹扩展试验,以及扫描电子显微分析与透射电子显微分析,研究了热机械处理对2E12铝合金的拉伸力学性能、疲劳性能以及微观组织结构的影响。采用本热机械处理可以使2E12合金同时获得优异的强度与塑性配合,其屈服强度较T3提高了28%,抗拉强度也提高了17%,同时其延伸率仍维持T3水平(16%以上)。热机械处理样品裂纹扩展速率低于T3及T6峰时效状态。热机械处理状态的合金中包含大量相互缠结的位错,并形成了位错胞状组织。新型热机械处理大幅提升合金综合性能的机制是多种复合组织结构的协同作用,包括位错亚结构、Cu/Mg溶质原子团簇及空位复合体、GPB区等。The effects of a novel thermo-mechanical treatment（TMT） on the mechanical properties and the microstructure of 2E12 aluminum alloy were investigated by tensile test and fatigue crack propagation test, as well as scanning electron microscope and transmission electron microscope（TEM）. Results show that a good combination of strength and plasticity can be achieved for 2E12 aluminum alloy by the new TMT, the yield strength increases by ~28% over that of T3, and the ultimate tensile strength also increases by 17%, while the high elongation of T3 condition（over 16%） is maintained. The fatigue crack growth rate of the TMT is lower than those of the T3 and T6 peak aged samples. A high density of tangled dislocation is contained in the TMT 2E12 aluminum alloy, and dislocation cell substructure is formed. The mechanism of the new TMT technique, by which the mechanical properties of the alloy is greatly increased, is the synergistic effect of composite structures, including dislocation cell substructures, the complex of Mg/Cu/vacancies, as well as GPB zones.

关 键 词：2E12铝合金 热机械处理 力学性能 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]