Author(s):
1. Ivana Ivanić, 1University of Zagreb, Faculty of Metallurgy Sisak, Croatia
2. Stjepan Kožuh, 1University of Zagreb, Faculty of Metallurgy Sisak, Croatia
3. Andrej Vračan, Croatia
4. Borut Kosec, University of Ljubljana, Faculty of Natural Science and Engineering, Slovenia
5. Mirko Gojić, Croatia

Abstract:
CuAlNi shape memory alloys (SMA) belongs to a group of alloys that exhibit shape memory effect which is related to the thermoelastic martensitic transformation. In this paper the influence of heat treatment (quenching and tempering) on fracture surface morphology of the CuAlNi SMA after tensile testing was examined by scanning electron microscope. It is observed a small difference on alloys mechanical properties and surface morphology between casted and quenched (850 °C/60’/WQ) condition. But after tempering at 300 °C/60’/WQ the mechanical properties and surface morphology is drastically changed. In both states (casted and quenched) can be noticed a transgranular type of fracture showing that the small amount of plastic deformation occurred, and along long oriented grains it is observed an intergranular type of fracture. After tempering the CuAlNi sample shows mostly intergranular type of fracture after tensile testing.

Key words:
shape memory alloys, CuAlNi, heat treatment, fracture analysis, microstructure

Thematic field:
Materials Science

Date of abstract submission:
12.04.2017.

Conference:
13th International Conference on Accomplishments in Mechanical and Industrial Engineering

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