微量Sc对AA7085铝合金组织与性能的影响  

Effect of minor Sc addition on microstructure and properties of AA7085 alloy

作　　者：肖代红[1] 巢宏[1] 陈康华[1] 黄伯云[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2008年第12期2145-2150,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(G2005CB623704);中国博士后科学基金特别资助项目(200801348);中南大学博士后科学基金资助项目(2007年)

摘　　要：通过铸锭冶金工艺,制备含微量Sc的AA7085铝合金。采用金相观察、力学性能测试、扫描电镜及透射电镜分析,研究添加0.3%Sc对基体合金的铸态及锻造态的显微组织和力学性能的影响。结果表明,添加0.3%Sc能细化铸态合金的晶粒,抑制锻造态合金的再结晶,最终提高基体合金的强度和断裂韧性;含0.3%Sc的合金抗拉强度达到562MPa,断裂韧性KIC(S-L)达到34MPa·m1/2。含Sc的AA7085合金的强化机制主要是Al3(Sc,Zr)相引起的细晶强化、亚结构强化和沉淀强化。AA7085 alloys with minor Sc content were prepared by ingot metallurgy method. The effect of Sc addition on the microstructure and mechanical properties of the based alloys was investigated using optical microscope, mechanical properties testing, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show that 0.3%Sc addition refines the grains of the casting alloys, and inhibits the recrystallization of the forged.alloy. AA7085 alloy with 0.3%Sc content has higher strength and fracture toughness, and trb and KIC（S-L） are 562 MPa and 34 MPa.m1/2, respectively. The strengthening mechanisms of AA7085 alloy with Sc element are mainly the sub-structure strengthening, precipitation strengthening and refiner grain strengthening of Al3（Sc, Zr） phase.

关 键 词：AA7085铝合金 SC 再结晶 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]