Abstract

This paper presents the first study on welding of Cu-based shape memory alloys. The superelastic wires used in the investigation had a nominal composition of Cu-17Al-11.4Mn (at.%). The pulsed Nd: YAG spot welding process altered the original bamboo-likemicrostructure of the base metal to a fusion zonewith fine equiaxed grains. Micro-load-indentation depth analysis revealed that the grain refinement increased the ductility of the fusion zone compared to the base material. Tensile tests did not show any significant difference between base material andwelded specimens, with failure occurring far away from thewelds in the larger grained base metal. Mechanical cycling and superelastic behavior of thewelded joints showed a faster stabilization of the hysteretic response than the base material, which is beneficial for applications where energy absorption is required. The Cu-Al-Mn superelastic alloy had a very high weldability and superior properties compared to other laser welded shape memory alloys, such as NiTi. (C) 2015 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)122-128
Number of pages7
JournalMaterials & Design
Volume90
DOIs
Publication statusPublished - 15 Jan 2016

Keywords

  • Cu-Al-Mn
  • Shape memory alloys
  • Laser welding
  • Superelasticity
  • CYCLIC DEFORMATION
  • STRAIN RESPONSE
  • NITI WIRES
  • PSEUDOELASTICITY
  • MICROSTRUCTURE
  • MARTENSITE
  • AUSTENITE
  • BEHAVIOR

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