Strengthening and toughening strategies of weld metal for in-situ nanoparticle reinforced tin bronze alloy

Abstract

As-cast in-situ nanoparticle reinforced CuSn10Zn2Fe1.5Co0.5 (wt-%) alloy was selected as base metal (BM) and filler for welding. Butt joints were obtained by tungsten inert gas (TIG) welding. Microstructure of weld metal was characterised. Nanoparticles with an average diameter of about 5 nm are uniformly dispersed in the primary copper matrix in size of micro or nano scales for weld metal. A large number of nano grains with size of about 20 nm can be found in the weld metal as well. Mechanical properties of weld metal were comparable to those of heat-treated BM. Strengthening and toughening strategies for the weld metal were discussed through fabricating in-situ nanoparticles and nano grains in the weld metal.

KEYWORDS:

• Tin bronze
• weld metal
• nano-structured
• mechanical property

Acknowledgements

The author is sincerely grateful to Auriga Zeiss workshop afforded by State Key Laboratory for Advanced Metals and Materials for microstructure characterisation. This work was supported by the Fundamental Research Funds for the Central Universities (No. FRFAT-19-002).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Fundamental Research Funds for the Central Universities [grant number FRFAT-19-002].