The Effect of Heat Treatment on Damping Capacity and Mechanical Properties of CuAlNi Shape Memory Alloy

Scientific paper - Original scientific paper

• Author: Ivana Ivanić; MBZ: 335063
• Author: Stjepan Kožuh; MBZ: 248081
• Author: Tamara Holjevac Grgurić; MBZ: 241081
• Author: Ladislav Vrsalović; MBZ: 237626
• Author: Mirko Gojić; MBZ: 63390
• Author's institution: Catholic University of Croatia
• Author's institution: University of Split; Faculty of Chemistry and Technology
• Author's institution: University of Zagreb; Faculty of Metallurgy
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (english)

This paper discusses the effect of different heat treatment procedures on the microstructural characteristics, damping capacities, and mechanical properties of CuAlNi shape memory alloys (SMA). The investigation was performed on samples in the as-cast state and heat treated states (solution annealing at 885 °C/60’/H2O and after tempering at 300 °C/60’/H2O). The microstructure of the samples was examined by light microscopy (LM) and scanning electron microscopy (SEM) equipped with a device for energy dispersive spectrometry (EDS) analysis. Light and scanning electron microscopy showed martensitic microstructure in all investigated samples. However, the changes in microstructure due to heat treatment by the presence of two types of martensite phases (β1’ and γ1’) influenced alloy damping and mechanical properties by enhancing alloy damping characteristics. Heat treatment procedure reduced the alloys’ mechanical properties and increased hardness of the alloy. Fractographic analysis of the alloy showed a transgranular type of fracture in samples after casting. After solution annealing, two types of fracture mechanisms can be noticed, transgranular and intergranular, while in tempered samples, mostly an intergranular type of fracture exists.

• Keywords (english): shape memory alloys; heat treatment; microstructure; damping capacity; tensile strength; hardness
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Materials
• Numbering: vol. 15, no. 5, 1825
• e-ISSN: 1996-1944
• DOI: https://doi.org/10.3390/ma15051825
• URN:NBN: urn:nbn:hr:115:975349
• Publication: 2022
• Project: Number: IP-2014-09-3405; Title (croatian): Dizajniranje mikrostrukture i funkcionalnih svojstava legura s prisjetljivosti oblika na bazi bakra; Title (english): Design of Microstructure and Functional Properties of Cu-based Shape Memory Alloys; Acronym: DMFP-CuSMA; Leader: Mirko Gojić; Jurisdiction: Croatia; Funding stream: IP
• Document URL: http://bib.irb.hr/1182627
• Type of resource: Text
• Access conditions: Open access
• Created on: 2022-03-02 07:35:41