J. T. Niu
,
Y. H. Tian
,
B. Y. Li
,
J. J. Xu
,
L.M. Liu (National Key Laboratory of Advanced welding Production Technology
,
HIT
,
Harbin 150001
,
China)
金属学报(英文版)
Tensile strength of diffusion welded joint of aluminum matrix composite is very low due to its poor weld- ability.In this paper, solution and age treatments were conducted on the welded joint of Al2O3p/ 6061Al composite subjected to diffusion welding using Gleeble 1500 machine, and ensile strength and microstructure of welded joint aged at175℃ were measured and analyzed respectively, Results showed that aging precipitation of welded joint is promoted effectively because of redistribution of reinforcement and a few number of dislocations in the matrix of weld zone resulting from welding pressure,and hence tensile strength of welded joint is increased significantly after aging treatment.
关键词:
aluminum matrix composite
,
null
,
null
L.H. Han
,
J.T. Niu
,
D.M. Jiang
金属学报(英文版)
The superplasticity of AlNp/6061Al composite, fabricated by powder metallurgy method and hot-rolled after extrusion, was investigated. The AlNp/6061Al composite exhibits an m-value of 0.49 and a maximum elongation of 438% in the strain rates ranging from 10-2-10°s-1 and at temperatures from 823K to 893K. Differential scanning calorimeter was used to ascertain the possibility of any partial melting in the vicinity of optimum superplastic temperature. These results suggested that liquid phase existed where maximum elongation was obtained.
关键词:
superplasticity
,
null
,
null
X.J.Xu
,
D. Zhang
,
Z.L. Shi
,
C.Z.Zhao and R.J. Wu (State Key Laboratory of Metal Matrir Composites
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China)
金属学报(英文版)
In this paper,the superplastic characteristics of the beta-SiC whisker reinforced 2024aluminum composite, fabricated by squeeze casting and hot-rolling after extrusion were investigated. The compsite had a fine grain size of about 2μm, and exhibited a strain rate sensitivity of about 0.35 and a maximum elongation of 350% at an initial strain rate of 1.1×10-1s-1 at 803K. In addition, the superplastic deformation mechanisme of the composite were also examined.
关键词:
high strain rate superplasticity
,
null
,
null
贺毅强
,
陈志钢
材料科学与工程学报
通过多层喷射沉积技术制备颗粒增强铝基复合材料，强化了冷却效果，能获得细小均匀的显微组织，优化复合材料中增强相的分布及其与基体的结合状态。本文综述了喷射沉积颗粒增强铝基复合材料的发展现状；介绍了多层喷射沉积技术的原理与工艺参数；概述了喷射沉积颗粒增强Al-Zn—Mg系、Al—Fe系与Al-Si系复合材料；并介绍喷射沉积颗粒增强铝基复合材料的致密化技术，着重介绍在小吨位设备上致密大块多孔材料的楔形压制工艺、外框限制轧制、陶粒包覆轧制工艺和热压后轧制工艺；展望了喷射沉积铝基复合材料的的发展趋势，认为增强颗粒与基体界面的结合强度有待进一步提高，提出了多层喷射沉积技术将朝在可编程控制下制备组织均匀、细小且致密度高的大尺寸坯料方向发展，而致密化技术也将朝小吨位设备制备大尺寸致密材料的方向发展，认为热压和楔形压制作为预致密方式能有效提高大尺寸喷射沉积坯料的成形能力，有利于进一步成形。
关键词:
多层喷射沉积
,
铝基复合材料
,
颗粒增强
,
致密化
张磊
,
王黎东
,
张瑞武
,
乔英杰
,
费维栋
材料科学与工艺
采用挤压铸造方法制备了硼酸镁晶须增强纯铝基复合材料，在450℃下对其进行了不同时间的退火处理，研究了不同退火时间对复合材料的室温力学性能、热膨胀行为及基体织构的影响．试验结果表明，退火处理能有效提高复合材料的抗拉强度，随着退火时间的增加材料的拉伸强度也逐渐增加，在5 h时达到最大值295 MPa，7 h时略有下降，为285 MPa．复合材料的热膨胀曲线表明，退火处理会使材料的热膨胀系数变大，随着退火时间的增加，材料的热膨胀系数先增加后减小，但始终高于未退火处理的材料．
关键词:
铝基复合材料
,
硼酸镁晶须
,
拉伸性能
,
热膨胀系数
卢棋
,
何国球
,
杨洋
,
佘萌
,
刘晓山
,
刘颺
材料导报
doi:10.11896/j.issn.1005-023X.2014.19.002
对国内外有关SiC颗粒增强铝基复合材料摩擦磨损的研究现状进行了系统的综述,分别介绍了内部因素(包括颗粒粒径、颗粒含量、颗粒形貌和基体材料)和外部因素(包括载荷、速度、温度和电流)对SiC颗粒增强铝基复合材料摩擦磨损性能的影响,并总结了SiC颗粒增强铝基复合材料在交通运输、航空航天和电子等领域中的应用.
关键词:
SiC
,
铝基复合材料
,
摩擦
,
磨损
岳红彦
,
林轩宇
,
张建交
,
高鑫
,
常靖
,
张虹
,
费维栋
材料热处理学报
采用溶胶-凝胶法在硼酸铝晶须表面涂覆了一层均匀的Cr2O3薄膜,然后超声分散涂覆的晶须湿法制备预制件,采用挤压铸造法制备了Cr2O3涂覆的硼酸铝晶须增强2024Al复合材料(ABOw/Cr2O3/2024Al).研究了该复合材料的时效行为和磨损性能.结果表明:Cr2O3涂覆硼酸铝晶须后,ABOw/Cr2O3/2024Al复合材料的峰时效时间延长,硬度水平、拉伸性能和耐磨性能显著提高.在相同载荷和转动速率下,铸态ABOw/Cr2O3/2024Al复合材料的磨损量少于ABOw/2024Al复合材料.T6热处理可以显著提高该复合材料的耐磨性.
关键词:
铝基复合材料
,
硼酸铝晶须
,
界面
,
时效
,
磨损性能
冯朝辉
,
苏海
,
高文理
,
卢健
,
陆政
机械工程材料
利用喷射共沉积、热挤压、轧制工艺制备了SiCp/2024铝基复合材料轧板,通过OM、SEM、TEM及XRD等手段研究了该复合材料轧制态和热处理态的显微组织和力学性能.结果表明:SiCp/2024复合材料坯经热挤压及轧制变形后,组织细小均匀,晶粒尺寸为2～3 μm,SiC颗粒均匀地分布于基体中,原尺寸较大的SiC颗粒发生破碎,呈钝化形貌;经 490℃固溶1 h及170℃时效8 h处理后,该复合材料的抗拉强度、屈服强度和伸长率分别为480 MPa,358 MPa和6.4%;基体合金中弥散分布的S'(Al2CuMg)相为其固溶时效处理后的主要沉淀强化相.
关键词:
喷射共沉积
,
铝基复合材料
,
显微组织
,
力学性能
,
轧制
