Zhiqiang YU
,
Gaohui WU
,
Longtao JIANG
,
Dongli SUN
材料科学技术（英文）
The liquid-phase coating method was used to deposit Y2O3 ceramic on the surface of α-Al¬2O3. The coated-Al2O3p/6061Al composites were produced using squeeze casting technology. The microstructure and tensile properties of the composites were analysed and studied. The results showed that the coated Al2O3 particles are able to disperse homogeneously in the aluminum liquid. The microstructure of the composites is more even in comparison with that of as-received powders. The tensile testing indicated that mechanical properties of the coated-Al2O3p/6061Al composites are better than those of uncoated particles. In the composite with 30% volume fraction, the tensile strength, yield strength as well as elongation is increased by 29.8%, 38.4% and 10.3%, respectively. The SEM analysis of fracture indicated that the dimples of the coated-Al2O3p /6061Al composites are more even.
关键词:
Submicron alumina powders
,
null
,
null
Longtao JIANG
,
Dongli SUN
,
Gaohui WU
,
Qiang ZHANG
,
Jianfeng CHEN
,
Norio KOUNO
材料科学技术（英文）
The microstructural characteristic of 1070Al matrix composites reinforced by 0.15µm Al2O3 particles whose volume fraction was 40% was investigated by TEM and HREM. The results showed that the interface between the matrix and reinforcements was clean and bonded well, without any interfacial reaction products. There were some preferential crystallographic orientation relationships between Al matrix and Al2O3 particle because of the lattice imperfection on the surface of Al2O3 particles.
关键词:
Al2O3p/Al composite
,
null
,
null
Qiang ZHANG
,
Gaohui WU
,
Dongli SUN
,
Bofeng LUAN
材料科学技术（英文）
The AlN particle reinforced aluminum matrix composites with 50% volume fraction were fabricated by squeeze-casting technology. The thermal expansion behavior and its response to thermal cycling were studied between 20℃ and 400℃. Compared with four theoretical models, the measured CTEs of the composite lie within the elastic bounds derived by Schapery's analysis. Schapery's model and Kerner's model agree well with the CTEs of the composites at lower temperature and elevated temperature, respectively. Strain hysteresis was observed between heating and cooling curves during cycling. This was attributed primarily to the anelastic behavior of the matrix induced by matrix residual stresses.
关键词:
AlN
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null
,
null
,
null
