Effect of Cu addition on microstructure and mechanical properties of NiTi based shape memory alloy

Year 2018, Volume: 2 Issue: 1, 20 - 26, 15.04.2018

Hakan Gökmeşe , Naci Arda Tanış Bülent Bostan

Abstract

In this research paper,
pre-alloyed NiTi based shape memory alloy and 4%Cu were used as starting powder
materials. Starting powder materials were blended for 60 minutes by a turbula
mixer. After mix processing, microstructure and phase transformations of
powders were characterized using X-ray (XRD), elemental distribution
spectrometry (EDS), scanning electron microscopy (SEM). Prepared powder
mixtures as NiTi and NiTi+4%Cu alloys were pressed at 785MPa in a mold and then
sintering process was applied to materials at different temperatures and time.
Formation of multiphase’s (Ni₃Ti, NiTi, Ti₂Ni, Ni₄Ti₃
and NiTiCu) and positive effects of Cu addition were obtained by
sintering at different temperatures and time. And also, stabilized NiTi phase
and increasing the value of micro hardness were determined with added 4%Cu
powders.

Keywords

Multiphase microstructure, NiTi alloy, NiTiCu, Shape memory alloys

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