累积叠轧焊温度和循环道次对AZ31镁合金组织和性能的影响

Effects of Rolling Temperature and Cycle Numbers on the Microstructure and Properties of AZ31 Magnesium Sheet during Accumulative Rolling-bonding

研究了累积叠轧焊温度变化和循环道次对AZ31镁合金板材组织和性能的影响,分析了累积叠轧焊工艺细化AZ31镁合金晶粒的机理。试验结果表明,加热温度从250℃增加到400℃时,第一个道次后的平均晶粒尺寸逐渐减小;在400℃保温5min、道次压下量为50%时,第二个道次的板材平均晶粒尺寸可以细化到1.3μm,抗拉强度为300MPa,伸长率达到25.2%。

Effects of rolling temperature and cycle numbers on microstructure and properties of the AZ31 magnesium sheets during accumulative rolling-bonding (ARB) were investigated,and the mechanism of grain refinement in AZ31 magnesium alloy during ARB was described. It is found that the average grain size is decreased with the temperature increasing from 250 ℃ to 400 ℃ after the first cycle period in ARB. The AZ31 sheets with average grain size of 1.3 μm and elongation of 25.2% as well as tensile strength of 300 MPa can be obtained by ARB at 400 ℃ with 50% thickness reduction per pass after the second recycle during ARB.