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硼对AlMg5Si2Mn合金组织与力学性能的影响
Effect of Boron on Microstructure and Mechanical Properties of AlMg5Si2Mn Alloy
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- DOI:
- 作者:
- 毕金亮1，赵荣达1，武晓峰2，王克研1，伍复发1
BI Jinliang1, ZHAO Rongda1, WU Xiaofeng2, WANG Keyan1, WU Fufa1
- 作者单位:
- 1. 辽宁工业大学材料学院，辽宁锦州121001；2.南昌工学院新能源车辆学院，江西南昌330108
1. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China; 2. School of NewEnergy Vehicle Academy, Nanchang Institute of Science & Technology, Nanchang 330108, China
- 关键词:
- Mg2 Si；显微组织；细化；力学性能
B; Mg2 Si; microstructure; refinement; mechanical properties
- 摘要:
- 通过对AlMg5Si2Mn合金加入不同含量的B，研究其对合金组织结构、拉伸性能、硬度的影响。 结果表明， 加入适量的B对AlMg5Si2Mn合金中的共晶Mg2 Si有较明显的变质作用。 加入0.1%B时，初生α-Al明显细化且部分 转变为等轴状； 长针状和大片层状的共晶Mg2 Si尺寸和片层间距明显减小。 抗拉强度从未变质时的235MPa提高到 310 MPa，提高了 32%；当 B含量达到0.22%时，共晶 Mg2 Si 全部转变为点状或纤维状，此时伸长率由未变质的3.9%上 升到9.1%，提高了130.9%，同时强塑积(PSE)也由未添加B时的925.9MPa·%增加到2684.5MPa·%。By adding different content of B to AlMg5Si2Mn alloy, the influence on the microstructure, tensile properties and hardness of the alloy was studied. The results show that the eutectic Mg2 Si in AlMg5Si2Mn alloy have obvious metamorphism by adding proper amount of B. When 0.1%B is added, the primary alpha-al is obviously refined and partially transformed into equiaxial shape. The size and spacing of the eutectic Mg2 Si in long needles and large sheets decrease obviously. The tensile strength of 235 MPa is increased to 310 MPa, which is increased by 32%. When the content of B reached 0.22%, eutectic Mg2 Si is all transformed into point or fiber. At this time, elongation increased from 3.9% without modification to 9.1% and 130.9%, and PSE increase from 925.9 MPa·% without B to 2 684.5 MPa·%.