热终轧工艺对Al-4.8Mg合金组织性能的影响

The Influence of Microstructure and Properties of Al-4.8Mg Alloy after Hot Final Rolling Process

摘要: 本文采用室温拉伸、弯曲试验、晶间腐蚀试验、光学显微镜、扫描电镜与透射电镜等分析手段，研究了热终轧工艺参数对Al-4.8Mg合金组织性能的影响。研究结果表明：当终轧工艺由低温低速向高温高速转变时，材料力学强度下降，而成形性能与抗晶间腐蚀性能提升；当材料金相组织由纤维状向细小再结晶晶粒转变时，通过扫描电镜观察到第二相特征差别不大，但透射电镜观察到位错密度明显下降。

Abstract: The influence of microstructure and properties of Al-4.8Mg alloy was studied after hot final rolling process parameters using room temperature tensile, bending test, intergranular corrosion test, light microscope, scanning electron microscopy and transmission electron microscopy in this work. When the final rolling process changes from low temperature and low speed to high temperature and high speed, the mechanical strength of the material decreases, but the forming performance and intergranular corrosion resistance increase. When the metallographic structure of the material changes from fibrous to fine recrystallized grains, the second phase characteristics are no difference by scanning electron microscopy, but the density of dislocation decreases significantly by transmission electron microscopy.