时效处理对锻态QA110-5-5铝青铜组织与性能的影响

摘要

Influences of aging treatment on microstructure and properties of forged QAll0-5-5 aluminum bronze were studied by hardness test, tensile test, X-ray diffraction analysis, microstructure observation. The results show that the aged QAll0 5-5 aluminum bronze exhibited fairly good mechanical properties when aging condition was 650 ℃×2 b. Under this aging condition, the hardness, tensile strength, yield strength and elongation of the aged alloy were 212 HB, 769 MPa, 492 MPa and 18.2% respectively, which were improved by 8. 16G, 6.22%, 12. 33% and 13. 94% respectively compared with those of the forged alloy, and more fine granular phase precipitated from alloy diffused well in the homogeneously distributed mierostructure of matrix of α-phase and (α+γ2)euteetoid.%通过硬度测试、拉伸性能测试、X射线衍射分析和显微组织观察等方法研究了时效处理对锻态OAll0-5-5铝青铜组织和性能的影响。结果表明：锻态QA0-5-5铝青铜较好的时效处理工艺为650℃×2h；在此工艺下，合金的硬度、抗拉强度、屈服强度、伸长率分别为212HB，769MPa，492MPa和18．23％，与锻态合金的相比分别提高了8．16％，6．22％，12．33％和13．94％；经650℃×2h时效后，基体α相和（α＋γ2）共析体组织分布均匀，合金中均匀析出了较多细颗粒状的κ相并弥散分布。