Nd:YAG laser welding of Ti-27 at.% Nb shape memory alloys

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• 作者：Abdollah Bahador ; Safaa N. Saud ; E. Hamzah ; T. Abubakar…
• 关键词：(IIW Thesaurus)Titanium alloys ; Shape memory alloys ; Laser welding ; Intermetallics ; Hardness
• 刊名：Welding in the World
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：60
• 期：6
• 页码：1133-1139
• 全文大小：1,899 KB
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669
• 卷排序：60

文摘

A Nd:YAG laser welding technique with varying pulse widths was employed to weld Ti-27 at.% Nb shape memory alloy plates, and subsequent phase transformation characteristics and microhardness of welds were systematically investigated. From microstructure observation, it is apparent that weld seams contain a columnar growth with the low pulse and transferred into a combined growth of columnar and planar with the high pulse width. Moreover, grains in the weld zone exhibited a finer size when compared to the unwelded zone. A small amount of NbTi₄ was also found in the welds. In the forward transformation, transformation temperatures did not exhibit peaks, indicating the same behaviour as the original TiNb alloy. Microhardness of the TiNb welds increased as the pulse width increased when compared to the original TiNb alloy. However, little reduction in hardness occurred after a pulse width of 5 ms.