Al-Mg-Sc和Al-Mg-Er合金的组织与性能  

Microstructure and Properties of Al-Mg-Sc and Al-Mg-Er Alloys

作　　者：傅乐[1] 雷学锋[1,2] 尹志民[1] 黄继武[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2012年第6期34-38,共5页Aerospace Materials & Technology

基　　金：国家重点基础研究发展计划资助项目(2012CB619503)

摘　　要：采用铸造—轧制—稳定化退火技术制备了Sc含量为0.10wt%和Er含量为0.25wt%的两种Al-Mg合金薄板,研究了不同处理工艺下两种合金板材拉伸性能、剥落腐蚀性能和显微组织的变化规律。结果表明,两种合金冷轧板材稳定化退火过程中拉伸性能有相同的变化规律,即随着退火温度升高,板材强度下降而塑性升高,Sc含量为0.10wt%的合金350℃/1 h退火仍然表现出很强的抗退火软化能力,而Er含量为0.25%的合金当退火温度高于280℃后迅速软化;300℃/1 h退火条件下,含Sc合金和含Er合金的抗拉强度、屈服强度和伸长率分别为424 MPa、314 MPa、18.3%和350 MPa、177 MPa、29.1%;与此同时,随退火温度的升高,板材抗剥落腐蚀的能力也表现出相同规律性的变化,即200℃/1 h左右退火时剥落腐蚀最严重,随着退火温度升高,腐蚀抗力增加,两种合金板材经280℃以上1 h稳定化退火后,合金板材可以获得较好的抗剥落腐蚀性能;其次,与Sc含量为0.25wt%的5B70合金相比,研制的Sc含量为0.10wt%合金综合性能接近5B70合金,而这种合金的Sc含量只有5B70合金的40%,能显著降低合金的制造成本,预示着低Sc含量的合金在航天领域有良好的开发应用前景。Two Al-Mg alloys plate with 0. 10wt% Sc and 0. 25wt% Er are prepared by casting-rolling-annealingtechnology. The variation of tensile properties, corrosion properties and microstructure of the two alloys at differenttreated condition was studied. The results show that the first, during annealing two alloys have same variation rule ofmicrostructure and properties, i. e. with the increase of annealing temperature, the strength decrease but the ductilityincrease. At 350℃ /1 h annealing the alloy with 0. 10wt% Sc shows strong annealing softing-resistent ability, but thealloy with Er become soft when the annealing temperature is higher than 280℃; at 300℃ /1 h annealing condition,the tensile strength,yield strength and elongation of the alloy with 0. 10wt% Sc and 0. 25wt% Er are 424 MPa,314MPa,18. 3% and 350 MPa,177 MPa,29. 1%, respectively. Meanwhile, the exfoliation corrosion resistance of thetwo alloys show the same variation rule, i. e. at 200℃ /1 h annealing the exfoliation corrosion resistance of the two alloysis the lest, then with increase of annealing temperature, the resistance increase. After 280℃ annealing for anhour,two alloys can get excellent exfoliation corrosion resistance. Compared with 5B70 alloy, tensile properties, corrosionproperties and annealing softing-resistent ability of the alloy with 0. 25wt% Sc is similar to 5B70 alloy, but itsmanufacture cost decreased, which shows good developing foresight on space vehicle.

关 键 词：AL-MG SC Er ZR 5B70 5A06 拉伸性能 剥落腐蚀 抗退火软化能力 

分 类 号：TG113.12[金属学及工艺—物理冶金]