摘要
针对预制裂纹的2A12铝合金板,采用搅拌摩擦的方法对裂纹进行修复,研究了修复过程热塑性材料的流场分布及修复区微观组织。结果表明,由于搅拌头的摩擦与搅拌作用,导致热塑性材料对裂纹间隙进行填补,经动态再结晶后使裂纹得到修复。热塑性材料总体流动趋势为漩涡状,修复区前进侧和返回侧的热塑性材料呈非对称流动。修复件从表面开始向下依次分布修复核心区、热机影响区、热影响区和母材,不同区域由于经历不同的热循环和搅拌头机械作用,导致显微组织的显著差异。
Friction stir repairing method was adopted in this paper to repair pre-cracked 2A12 aluminum alloy plates,and the flow pattern of thermoplastic material and microstructures of repaired specimens were analyzed.The results showed that thermoplastic material could fill up the crack gap because of the friction andstirring actions of the repairing tool,and finally healed the crack through dynamic recrystallization.The flow pattern of thermoplastic material was like a vortex and asymmetric in advancing and retreating sides.The repaired specimen could be divided into repairing core zone,thermo mechanical affected zone,heat affected zone and base material,and these zones exhibited remarkably different microstructures because of different thermal cycles and mechanical action caused by the repairing tool.
出处
《沈阳航空航天大学学报》
2017年第2期44-48,共5页
Journal of Shenyang Aerospace University
基金
国家自然科学基金(项目编号:51405309)
辽宁省自然科学基金(项目编号:2015020183)
关键词
搅拌摩擦修复
裂纹
铝合金
流场
微观组织
friction stir repairing
crack
aluminum alloy
flow field
microstructure
