亚微米颗粒增强6061铝基复合材料的微塑变特性

发现亚微米级Ａｌ２Ｏ３ｐ／６０６１复合材料的微屈服抗力较高，组织稳定性良好，其微屈服抗力与微塑变符合Ｂｒｏｗｎ和Ｌｕｋｅｎｓ提出的线性规律；通过与ＳｉＣｐ／６０６１和ＡｌＮｐ／６０６１的微屈服行为与组织的对比分析，认为增强颗粒形状，尺寸以及基体中位错密度，亚晶粒尺寸等因素直接影响屈服抗力，亚微米级颗粒增强复合材料对尺寸稳定性要求来说，微观组织形态较合理，是较理想的精密仪表材料。

MICROYIELD DEFORMATION CHARACTERISTIC OF PARTICLE WITH SUBMICRON SCALE REINFORCED 6061 Al MATRIX COMPOSITE

In the present paper, microyield characteristic of a Al2O3p /6061 composite was investigated and its microstructure was observed by TEM and HREM. It indicated that the Al2O3p/6061 composite had high microyield stress and good microstructure stability comparing to unreinfOrced 6061 alloy. And the relationship between microyield stress and microplastic strain was in keeping with the linear rule proposed by Brown and Lukens. By studying on the microyield behaviors and microstructures of Al2O3p/6061. SiCp/6061 and AlNp/6061 composites, it was found that the microyield stress was directly efFected by geometry shape, size, distribution of the reinforcement and dislocation density,precipitate, subcrystalline grain size in the matrix and interfacial bonding condition between the reinforcement and the matrix, etc.. Particulate in submicron scaIe reinforced composites have reasonablemicrostructrues for improving dimensional stability property, and is ideal material choice for precise instruments in present.