Transactions of Materials and Heat Treatment

Title：Current resistance heating forming technology of Al-Li alloy 5A90 stringers

Authors： Xiao Han Zhang Kaifeng Jiang Jufu Wang Bo Yi Zhuoxun Lai Xiaoming

Unit： Harbin Institute of Technology Beijing Spacecrafts

KeyWords： Al-Li alloy 5A90 stringers high temperature tensile current resistance heating forming lubrication

ClassificationCode：TG307

year,vol(issue):pagenumber：2017,42(7):66-71

Abstract：

Al-Li alloy with advantages of low density, high specific strength etc.is the desirable material to realize the weight loss for aircraft structure, which shows strong competitiveness and broad application prospect in the field of aerospace and aviation. The advanced electrical heating forming technology is an effective way to improve the formability of light alloy. Therefore, the formability of Al-Li alloy 5A90 was studied by high temperature tensile experiment. And the best forming temperature of Al-Li alloy 5A90 sheet is 340 ℃.Then, the appropriate current density of Al-Li alloy 5A90 sheet under heating is 10 A·mm-2, which is obtained by the current resistance heating experiment. Furthermore, the device of current resistance heating forming for Al-Li alloy 5A90 stringers was designed and produced to solve the problem of poor formability at room temperature. The Al-Li alloy 5A90 stringers were formed by the current resistance heating forming process to meet the requirements, and the influences of temperature, lubrication and other factors on the quality of Al-Li alloy 5A90 stringers were analyzed. Thus, the new current resistance heating forming process and corresponding devices for sheets have great significance in practical application.

Funds：

国家自然科学基金资助项目（51675125）；“高档数控机床与基础制造装备”科技重大专项（2014ZX04001-171）

作者简介：肖寒(1990-)，男，博士研究生，E-mail：vildenceline@126.com；通讯作者：张凯锋（1951-），男，博士，教授，E-mail：kfzhanghit@163.com

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