Machinability of Ni-rich NiTiHf high temperature shape memory alloy

Kirmacioglu E., Kaynak Y., Benafan O.

SMART MATERIALS AND STRUCTURES, vol.28, no.5, 2019 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 5
  • Publication Date: 2019
  • Doi Number: 10.1088/1361-665x/ab02a2
  • Journal Name: SMART MATERIALS AND STRUCTURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: NiTiHf shape memory alloy, machinability, tool wear, force components, TOOL-WEAR, CHIP FORMATION, DRY, PERFORMANCE, MICROSTRUCTURE, OPTIMIZATION, DEFORMATION, MECHANISM, BEHAVIOR, PHASE
  • Marmara University Affiliated: Yes

Abstract

Machining of Ni-rich Ni50.3Ti29.7Hf20 (at%) high temperature shape memory alloys was evaluated under flood cooling conditions. Effects of various cutting speeds (between 20 and 120 m min(-1)), depth of cuts (between 0.4 and 1 mm), and the associated cutting forces on the work-piece surface quality and tool wear of this alloy are presented. Experimental data demonstrates that abrasion and adhesion were the predominant wear mechanisms leading to extreme wear in a short machining time. Thermal softening mechanism dominated the trend of cutting forces until 95 m min(-)1 cutting speed. Beyond this speed, force components sharply increased resulting from extreme tool wear. Chip breakability of this alloy is much better when compared to NiTi shape memory alloy.