Mechanical, fatigue and super plasticity properties of Cu-Al-Mn, Cu-Al-Be-Mn shape memory alloy and their metal matrix composites.

This study explores the characteristics and potential engineering applications of Cu-Al-Mn and Cu-Al-Be-Mn shape memory alloys (SMAs). The research investigates the chemical composition, transformation temperatures, and mechanical properties of these SMAs when incorporated into Al metal matrix composites (MMCs). It was found that the addition of Mn and Be, has a significant impact on the performance of Cu-Al alloys. Among Cu-Al-Mn SMAs, SMA1, with a composition of Cu-80.94%, Al-10.54%, and Mn-8.52%, exhibited superior strain recovery, super elasticity (SE), and improved mechanical properties compared to other compositions. The study also demonstrates that the inclusion of SMA fibres in Al composites enhances residual strength, energy absorption capacity, and the ability to close fissures, contributing to a more robust and resilient material. In the case of Cu-Al-Be-Mn SMAs, SMA6, with Cu-87.42%, Al-11.8%, Be-0.48%, and Mn-0.3%, showcased improved properties, outperforming other compositions in terms of strain recovery, residual strength, energy absorption capacity, and crack-closing ability. These findings suggest that Cu-Al-Be-Mn SMAs hold promise for various engineering applications. The study provides valuable insights into the potential of these SMAs to enhance the performance of structural materials, offering increased strength, ductility, and resilience. This research contributes to a deeper understanding of the applications and advantages of SMAs in the field of engineering.