微量Sc和Zr对Al-Mg-Mn合金组织与力学性能的影响  

Effects of minor scandium and zirconium on microstructure and mechanical properties of Al-Mg-Mn alloys

作　　者：陈琴[1] 潘清林[1,2] 王迎[1] 彭虹[2] 张志野[1] 尹志民[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]武汉职业技术学院轻工学院,武汉430074

出　　处：《中国有色金属学报》2012年第6期1555-1563,共9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(2012CB619503)

摘　　要：采用活性熔剂保护熔炼、水冷铜模激冷铸造制备Al-5.8Mg-0.4Mn和Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr(质量分数,%)两种合金铸锭。合金铸锭经热轧中间退火冷轧成2 mm薄板;研究稳定化退火及微量Sc和Zr对Al-Mg-Mn合金组织与性能的影响。结果表明:在Al-Mg-Mn合金中加入微量Sc和Zr后形成大量弥散的Al3(Sc,Zr)粒子,这些粒子对位错和亚晶界具有强烈的钉扎作用,能明显提高合金的抗再结晶能力和室温力学性能;Al-Mg-Mn-Sc-Zr合金板材经300℃退火1 h后可获得最佳综合力学性能,其σb、σ0.2与δ分别为436 MPa、327 MPa和16.7%。Both Al-5.8Mg-0.4Mn and Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr （mass fraction, %） alloy ingots were prepared using water chilling copper mould ingot metallurgy processing protected by active flux. The alloy ingots were finally rolled into 2 mm-thick sheets after hot rolling-intermediate annealing-cold rolling. The effects of stabilizing annealing and minor Sc, Zr on the microstructure and mechanical properties of Al-Mg-Mn alloys were studied. The results show that after adding minor Sc and Zr into Al-Mg-Mn alloy simultaneously a large number of Al3（Sc, Zr） particles dispersedly distribute in the matrix, which have function of strongly pinning sub-grain boundaries and dislocations. The anti-recrystallization ability and the mechanical properties of the Al-Mg-Mn-Sc-Zr alloy sheet are significantly improved. By annealing at 300 ℃ for 1 h, the Al-Mg-Mn-Sc-Zr alloy sheet can obtain the optimum application values ofσb, σ0.2 and δ, which are 436 MPa, 327 MPa and 16.7%, respectively.

关 键 词：Al-Mg-Mn-Sc-Zr合金 稳定化退火 再结晶 Al3(Sc Zr)粒子 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]