Abstract
Shape memory alloys (SMAs) are among the “smart” materials that can virtually remember their original shape; after being deformed, they may return to their initial shape through heating. The shape memory effect derives from a martensitic transformation induced by stress and/or temperature change. Copper-based SMAs are a more economical alternative compared to Ni-Ti alloys. They have low cost and various interesting mechanical and thermal properties and high practical value for the applications. In this present work, Cu-Zn-Al shape memory alloys with 0.1−0.5 wt.% In were studied. Investment casting (lost-wax casting) was performed at 1100 °C melting temperature and 650 °C mold temperature. Shape memory effect of the alloys was investigated with bending test and then heating for shape recovery. Scanning and transmission electron microscopes were used for microstructural characterization along with Energy X-ray diffraction and selected area diffraction spectroscopy. XRD measurement was also performed to understand effect of indium on microstructure. The results clearly presented that the addition of In in Cu-Zn-Al SMAs caused a precipitation of the second phase and significantly alternated the shape memory effect. The microstructure and orientation relationship of the typical and twinned martensite were discussed.
Highlights
Shape memory alloys (SMAs) are a group of “smart” materials that can “remember” their original shape, i.e. they can return to their pre-deformed shape after being heated
The results clearly presented that the addition of In in Cu-Zn-Al SMAs caused a precipitation of the second phase and significantly alternated the shape memory effect
The shape memory effect of the Cu-Zn-Al SMAs with indium addition was expressed in term of the strain recovery ( ), in table 1, from the first bending test with subsequent heating
Summary
Shape memory alloys (SMAs) are a group of “smart” materials that can “remember” their original shape, i.e. they can return to their pre-deformed shape after being heated. Shape memory effect of the alloys was investigated with bending test and heating for shape recovery. The results clearly presented that the addition of In in Cu-Zn-Al SMAs caused a precipitation of the second phase and significantly alternated the shape memory effect. The Cu-Zn-Al shape-memory alloy with various indium additions was shaped with the investment casting process.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
