Cu－Al粉末烧结合金内氧化后的组织与性能

通过测定内氧化强化型Ｃｕ－Ａｌ合金的电阻率、耐蚀、耐磨、抗压性能及ＳＥＭ、ＴＥＭ形貌观察，研究了内氧化对合金组织与性能的影响。结果表明：内氧化层中，内氧化物沿晶界呈网状生长，晶内是Ｃｕ基体加弥散分布的氧化物质点。内氧化使基体Ａｌ原子的固溶量减少，降低了合金的电阻车，增加了合金的致密度及弥散强化效果，因而使５％Ａｌ－Ｃｕ粉末烧结合金的耐蚀、耐磨及抗压性能明显提高。

STRUCTURE AND PROPERTIES OF Cu-Al POWDER SINTERED ALLOY AFTER INTERNAL OXIDATION

In this paper,the effect of internal oxidation on structure and properties of alloy has beenstudied by testing resistivity,resistance to corfosion,wear and compression and by surveying SEM andTEM morphology of internal oxidation strensthened Cu-Al alloy. The results show that in internal oxidation layer,the internal oxides grow along grain boundary in strip and laminar form,and in grain,there are Cu substrate and dispersed distribution of oxide particles. Internal oxidation decreases thequantity of solid solution of Al atom in substrate,lowers the esistivity of alloy and increases the densityand dispersion strengthening effects. As a result the resistance to corrosion, wear and compression of5% Al-Cu powder sintered alloy is improved.