Optimisation of Heat Treatments on Shape Memory Effect of Cu-24Zn-3.65Al wt. % Alloy Produced by Gravity Casting

A. Setyani, A. Novakusuma, B. T. Sofyan

Research output: Contribution to journalConference articlepeer-review

Abstract

The Cu-Zn-Al alloy has become one of the prospective shape memory alloys (SMA). Its shape memory effect (SME) reported can be enhanced by applying appropriate heat treatment. Therefore, heat treatments with varied methods and media quenching are proposed to optimise SME in this research. The Cu-24Zn-3.65Al. wt. % alloy was produced by gravity casting and then homogenised at 800 ℃ for 2h, followed by air cooling. It was then betatized at 850 ℃ for 30 minutes, followed by two different quenching methods: direct quenching (DQ) and up quenching (UQ) using water and dry ice (WD) as well as saltwater and dry ice (SD) as the medium. The characterisation was performed by optical microscope, SEM-EDS, Vickers, DSC and bending test. The results show that DQ_WD and UQ_WD samples are consisted of β' martensite and retained α. In contrast, DQ_SD and UQ_SD produce a complete β' martensite phase. The bending test showed that UQ_SD has the highest SME 94%, followed by DQ_SD 84.5%, UQ_WD 73.47%, and DQ_WD 61.49%. The UQ method by using SD cooling media was found effective in increasing SME.

Original languageEnglish
Article number070046
JournalAIP Conference Proceedings
Volume2689
Issue number1
DOIs
Publication statusPublished - 21 Jul 2023
EventSriwijaya International Conference on Engineering and Technology 2021, SICETO 2021 - Hybrid, Palembang, Indonesia
Duration: 25 Oct 202126 Oct 2021

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