摘要
在纯氮气保护下,对泡沫铝及3003型面板开展了焊接温度为605℃保温时间为10min的钎焊实验,采用金相观察、三点弯曲实验等分析测试方法,对泡沫铝/铝夹芯板的焊缝处的微观组织、界面结合、力学性能及断裂失效机理展开研究.结果表明:在605℃保温10min的条件下,钎料与母材实现了良好的冶金结合,焊缝中心组织主要由初生α-Al基体及针状共晶Si组成;泡沫铝/铝夹芯板在三点弯曲变形过程中会经历弹性、坍塌和失效三个变形阶段,其断裂机理属于芯层剪切断裂,而双侧焊接方式可以有效提高泡沫铝/铝夹芯板的受力载荷.
Under the protection of N2, the brazing experiments were carried out on the foamed aluminum and 3003 panels with the welding temperature at 605℃ for 10 min. In this paper, the metallographic observation and the three-point bending tests were used to analyze the microstructure and interracial bonding of brazed seam, mechanical properties and fracture failure mechanism of the aluminum foam/ aluminum sandwich. The results show that the brazing filler metal is adequately bonded to the base metal under the condition of 605 ℃ for 10 min, and the central microstructure of the weld is mainly composed of primary a-A1 matrix and needle eutectic Si. The aluminum foam/aluminum sandwich in the three-point bending experiment was experienced three stages of elastic deformation, collapse and failure, and its fracture mechanism belongs to the core shear fracture. Besides, the double-sided welding method can effectively improve the force load of the aluminum foam/aluminum sandwich.
出处
《材料研究与应用》
CAS
2017年第3期167-171,共5页
Materials Research and Application
关键词
泡沫铝
钎焊
微观组织
三点弯曲
断裂机理
aluminum foam
brazing
microstructure
three-point bending
fracture mechanism
