摘要
对AZ31B镁合金板材在443K、483K和523K三个温度下,在模具上进行不同道次的等温循环弯曲试验,对试验工艺进行了研究。利用金相显微镜和X射线衍射观察并且测量了该工艺条件下镁合金板材微观组织和宏观织构的变化情况。结果显示,在443K和483K温度下,主要由孪晶来协调变形,并且在孪晶带附近产生了最初的再结晶晶粒,在523K时,最初再结晶晶粒产生在晶界处。在483K循环弯曲3个道次的情况下,其室温延伸率由12.4%提高到17.1%,提高约为42%,其基面织构最大相对强度由9.8降到了5.75,但室温下抗拉强度基本不变。
In this work, Mg alloy AZ31B sheet was studied by repeated bending in mold at 443K,483K, and 523K. The sheet microstructure and texture change by the metallurgical microscope and X-ray diffraction are observed and measured. The results indicate that the twinning is the dominant deformation mechanism at the 443K and 483K, and initial recrys- tallization was found near the twinning boundaries. Initially recrystallization was found at the grain boundaries at 523K. After 3 passes at 483K,the fracture elongation was increased from 12.4 % to 17.1%, increase of approximately 42 %, the base texture maximum relative strength decreased from 9.8 to 5.75, but the tensile strength is substantially constant.
出处
《沈阳理工大学学报》
CAS
2013年第3期5-8,共4页
Journal of Shenyang Ligong University
关键词
循环弯曲
织构
再结晶
repeat bending
texture
recrystallization