Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy
文献类型：期刊论文
| 作者 | Wu, LH; Zhang, H; Zeng, XH; Xue, P; Xiao, B; Ma, ZY; Ma, ZY (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China. |
| 刊名 | SCIENCE CHINA-MATERIALS
 |
| 出版日期 | 2018-03-01 |
| 卷号 | 61期号:3页码:417-423 |
| 关键词 | Lamellar Microstructure Titanium Joint Deformation Evolution Behavior Surface Nugget Zone |
| ISSN号 | 2095-8226 |
| 英文摘要 | The superplastic forming of Ti alloy welds has great application prospects in producing integrated components. However, the nugget zone (NZ) of the Ti alloy welds, produced by fusion welding or conventional friction stir welding (FSW), consists of lamellar microstructure, which exhibits either low superplasticity or high superplastic temperautre and low strain rate. As a result, the NZ plays a leading role in hindering the superplastic forming of the whole welds. In this study, submerged friction stir welding (SFSW) was conducted in Ti-6Al-4V alloy for the first time, and a defectfree weld with the NZ consisting of a strip microstructure was obtained. The NZ exhibited a low-temperature superplasticity at 600 degrees C, which was the lowest superplastic temperature ever reported in the Ti alloy welds. Besides, at 800 degrees C, the NZ showed high strain rate (3x10(-2) s(-1)) superplasticity and a largest elongation of 615% at 1x10(-3) s(-1). Compared to conventional FSW joints, the NZ of SFSW joint exhibited a much lower flow stress and a decrease in optimal superplastic temperature by 100 degrees C. This is mainly attributed to the easy globularization of the strip microstructure, enhancing the ability of grain/phase boundary sliding.; The superplastic forming of Ti alloy welds has great application prospects in producing integrated components. However, the nugget zone (NZ) of the Ti alloy welds, produced by fusion welding or conventional friction stir welding (FSW), consists of lamellar microstructure, which exhibits either low superplasticity or high superplastic temperautre and low strain rate. As a result, the NZ plays a leading role in hindering the superplastic forming of the whole welds. In this study, submerged friction stir welding (SFSW) was conducted in Ti-6Al-4V alloy for the first time, and a defectfree weld with the NZ consisting of a strip microstructure was obtained. The NZ exhibited a low-temperature superplasticity at 600 degrees C, which was the lowest superplastic temperature ever reported in the Ti alloy welds. Besides, at 800 degrees C, the NZ showed high strain rate (3x10(-2) s(-1)) superplasticity and a largest elongation of 615% at 1x10(-3) s(-1). Compared to conventional FSW joints, the NZ of SFSW joint exhibited a much lower flow stress and a decrease in optimal superplastic temperature by 100 degrees C. This is mainly attributed to the easy globularization of the strip microstructure, enhancing the ability of grain/phase boundary sliding. |
| 学科主题 | Materials Science, Multidisciplinary |
| 语种 | 英语 |
| 资助机构 | National Natural Science Foundation of China [51471171, 51601194, 51331008] |
| 公开日期 | 2018-06-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79452]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Ma, ZY (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Wu, LH,Zhang, H,Zeng, XH,et al. Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy[J]. SCIENCE CHINA-MATERIALS,2018,61(3):417-423. |
| APA | Wu, LH.,Zhang, H.,Zeng, XH.,Xue, P.,Xiao, B.,...&Ma, ZY .(2018).Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy.SCIENCE CHINA-MATERIALS,61(3),417-423. |
| MLA | Wu, LH,et al."Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy".SCIENCE CHINA-MATERIALS 61.3(2018):417-423. |
入库方式： OAI收割
来源：金属研究所
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