Size effect and strain induced double twin by nanoindentation in DSS weld metal of vibration-assisted GTAW

Chun Hway Hsueh, Min Jen Liao, Shing Hoa Wang, Yu Ting Tsai, Jer Ren Yang, Rudder Wu, Woei Shyan Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The nanohardness values and modulus of the prior δ phase in both direct current (DC) and vibration-assisted (VIB) weld metal were higher than those of the base metal. The dislocation density in the δ phase matrix was the highest in the VIB weld metal, followed by the DC weld metal and the base metal. Therefore, the higher nanohardness value in the δ phase, especially for the VIB welding, was attributed to the existence of a higher dislocation density. By contrast, the nanohardness values of the γ phase in both weld metals were not affected by the welding process. The predicted nanohardness value of the composite phase with the rule-of-mixture was consistent with the result of nanoindentation measurements. The deformation induced a V-shaped double twin was revealed by the effect of nanoindentation on the austenite grain of the VIB weld metal.

Original languageEnglish
Pages (from-to)40-50
Number of pages11
JournalMaterials Chemistry and Physics
Volume219
DOIs
Publication statusPublished - 2018 Nov 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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