5A90铝锂合金电子束焊接头超塑性变形组织演变

程东海; 陈龙; 陈益平; 胡德安

5A90铝锂合金电子束焊接头超塑性变形组织演变

1.
南昌航空大学航空制造工程学院, 南昌 330063
2.
南昌航空大学航空制造工程学院, 南昌 330063;江铃控股有限公司, 南昌 330063

基金项目: 国家自然科学基金资助项目（51465042）；航空科学基金资助项目（2013ZE56）

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出版历程
- 收稿日期: 2015-05-12

Microstructure evolution of electron beam welded 5A90 aluminum lithium alloy during superplastic deformation

1.
Aviation Manufacturing and Engineering College, Nanchang Hangkong University, Nanchang 330063, China
2.
Aviation Manufacturing and Engineering College, Nanchang Hangkong University, Nanchang 330063, China;Jiangling holding co., LTD, Nanchang 330063, China

摘要

摘要: 对5A90铝锂合金电子束焊接头进行高温拉伸试验，使用光学显微镜观察试样变形过程中的组织演变，并对变形机理进行分析.结果表明，超塑性变形初期，接头超塑性变形机制以扩散导致的晶界迁移为主，焊缝细小等轴晶粒迅速长大.当应变大于100%时，接头中大晶粒开始发生动态再结晶，超塑性变形机制转变为动态再结晶机制.在超塑性变形过程中热影响区平均晶粒尺寸与焊缝平均晶粒尺寸逐渐接近，组织存在耦合均匀化过程.提出采用均匀化系数K来表征焊缝与热影响区的组织均匀化程度，随着变形的进行，K值逐渐升高.
- 铝锂合金 /
- 电子束焊 /
- 超塑性成形 /
- 组织演变
Abstract: High temperature tensile test of 5A90 aluminum lithium alloy electron beam welding joints was carried out, using optical microscope to observe the microstructure evolution of the sample during deformation, and the deformation mechanism was analyzed. The results showed that the superplastic deformation mechanism at the initial stage of superplastic deformation mainly depended on the grain boundary migration caused by diffusion, and the fine equiaxed grains of the weld seam grew rapidly. When strain was greater than 100%, large grains in the joint began to arise dynamic recrystallization, and superplastic deformation mechanism changed into dynamic recrystallization mechanism. During superplastic deformation, the average grain size of the heat affected zone was close to the average grain size of the weld, and there was a homogenization process in the microstructure. Homogenization coefficient K was used to characterize the degree of homogenization of the weld and heat affected zone. With the deformation, the K value increased gradually.
- aluminum lithium alloy /
- electron beam weld /
- superplastic deformation /
- microstructure evolution

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参考文献(5)

[1]	尹登峰, 郑子樵. 铝锂合金研究开发的历史与现状[J]. 材料导报, 2003, 17(2): 18-20. Yin Dengfeng, Zhang Ziqiao. History and current status of aluminum-lithium alloys research and development[J]. Materials Review, 2003,17(2): 18-20.
[2]	于卫新, 李淼泉, 胡一曲. 材料超塑性和超塑成形/扩散连接技术及应用[J]. 材料导报, 2009, 23(6): 8-14. Yu Weixin, Li Miaoquan, Hu Yiqu. Superplasticity and application of superplastic forming/diffusion bonding technology[J]. Materials Review, 2009, 23(6): 8-14.
[3]	程东海, 黄继华, 陈益平. 激光焊接超塑性变形组织特征[J]. 焊接学报, 2012, 33(7): 89-92. Cheng Donghai, Huang Jihua, Chen Yiping. Laser welding characteristics superplastic deformation[J]. Transactions of the China Welding Institution, 2012, 33(7): 89-92.
[4]	Ma Z Y, Mishra R S, Mahoney M W. Superplastic deformation behaviour of friction stir processed 7075Al alloy[J]. Acta Materialia, 2002, 50(17): 4419-4430.
[5]	刘小文, 谷建军, 马彩霞. 搅拌摩擦焊接焊缝金属的超塑性行为[J]. 稀有金属材料与工程, 2009, 38(增刊): 415-418.Liu Xiaowen, Gu Jianjun, Ma Caixia. Superplastic behavior of weld metal by friction stir welding[J]. Rare Metal Materials and Engineering, 2009, 38(Z1): 415-418.[6] 张凌云, 祁桂根. 铝锂合金在航空业的应用及SPF/DB工艺进展[J]. 金属成形工艺, 2001, 19(3): 1-3.Zhang Lingyun, Qi Guigen. Application of Al-Li alloys in aeronautical industry and advances on SPF/DB[J]. Metal Forming Technology, 2001, 19(3): 1-3.[7] 狄欧. 铝锂合金的焊接技术研究进展[J]. 航空制造技术, 2006(9): 90-93.Di Ou. Progress in welding technology of Al-Li alloy[J]. Aeronautical Manufacturing Technology, 2006(9): 90-93.[8] 王亚军, 毛智勇, 白韶军. 1420铝锂合金电子束焊接接头力学性能[J]. 航空工艺技术, 1998(6): 12-13.Wang Yajun, Mao Zhiyong, Bai Shaojun. 1420 Al-Li alloy electron beam welding joint mechanical properties[J]. Aeronautical Manufacturing Technology, 1998(6): 12-13.[9] 张吉人, 王雨丛. Zn4%Al合金超塑性变形微观过程的研究[J]. 哈尔滨工业大学学报, 1985 (S3): 1-5.Zhang Jiren, Wang Yucong. Zn4%Al alloy in the process of superplastic deformation of the micro research[J]. Journal of Harbin Institute of Technology, 1985 (S3): 1~5.[10] Hu Jing, Lin Dongliang. Superplasticity of single-phase Ni-48Al intermetallics with large grains[J]. Materials Letters, 2004(58): 1297-1301.