热轧镁/铝复合板的组织演变与拉伸性能研究

Study on Microstructure Evolution and Tensile Properties of Hot Rolled Mg/Al Composite Plates

在不同压下率(40%、45%和50%)条件下采用普通平辊热轧技术制备了镁/铝复合板,并对50%压下率下制备得到的复合板进行了不同温度的退火处理,分析了不同压下率和不同退火温度对界面组织和拉伸性能的影响。结果表明,单道次轧制后,未经退火处理时,镁/铝复合板界面结合良好,无裂纹、金属间化合物出现。随着轧制压下率的增加,轧制态试样的抗拉强度提高。当压下率为50%时,最大抗拉强度为278 MPa。在50%的压下率下,随着退火温度的升高,镁/铝复合板的金属间化合物厚度增加。但是随着退火温度的升高,抗拉强度降低,当退火温度为350℃时,抗拉强度最低为220 MPa。

Mg/Al laminated composites were prepared based on the conventional flat roll under various reduction ratios(40%,45%and 50%)at 400℃.What's more,different annealing temperatures were applies for the composite plates at 50%reduction ratio.The effects of the various reduction ratios and annealing temperature on the interfacial microstructure and tensile properties were analyzed.The results show that after single pass rolling,the interface of magnesium/aluminum composite plate is well combined without annealing treatment,no cracks and intermetallic compounds appear.With the increase of rolling reduction rate,the tensile strength of rolled sample increases.At 50%reduction,the maximum tensile strength is 278 MPa,and the thickness of the intermetallic compound of the magnesium/aluminum composite plate increases with the increase of annealing temperature.With the increase of annealing temperature,the tensile strength decreases.When the annealing temperature is 350℃,the lowest tensile strength is 220 MPa.