摘要
采用热轧工艺一道次制备出AZ31镁合金/L2纯铝复合板材,并研究了退火工艺对复合板结合强度的影响。结果表明,在50%压下率和425℃轧制条件下,AZ31镁合金和L2纯铝板材经单道次热轧变形后完全复合,复合板外观完整,无宏观裂纹,结合面剪切强度为29 MPa。退火温度≥300℃时,AZ31/L2复合板界面处生成硬脆的中间相,导致结合强度严重下降。经250℃×15 MPa的热压退火处理后,复合板结合强度达到37 MPa,剥离面内密布大量条带状撕裂棱,热压退火工艺可以提高复合板的结合强度。
AZ31/L2 clad sheet was prepared by hot roll bonding process in one pass , and effect of annealing on strength of bonding interface was investigated .The results show that at the condition of 425 ℃deformation temperature and 50% rolling reduction , AZ31 and L2 sheet is complete composited by single pass hot rolling deformation , which appears integrity and no macrocrack , shear strength of the interface is 29 MPa.Hard and brittle intermediate phase should be occurred at interface of AZ 31/L2 clad sheet which result to bonding strength decrease when annealing temperature is above 300 ℃.After hot-pressed annealing treatment at 250 ℃ with 15 MPa, the shear strength can reach to 37 MPa, and a lot of tear ridges with stripped shape appear in the peeled surface .Hot-pressed annealing can improve the bonding strength of the clad sheet .
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第3期31-35,共5页
Heat Treatment of Metals
