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<p>In the present study, ultra-fine-grain Al/Cu/Ag shape memory alloys were fabricated via an accumulative roll bonding (ARB) process. The primary materials were pure Al, Cu and Ag particles. The Al content was 10 wt.% in all composites, while the Ag content was between 1 and 3 wt.%. After the fabrication of composite samples via ARB, all of Al/Cu/Ag composite samples were heat treated between 800 and 1100°C for 60 min and then were quenched to the ambient temperature. The influences of various Ag contents and heat treatment temperatures on the structural evolution of composite samples were investigated. Then, mechanical properties, fracture toughness (FT), forming limit diagram (FLDs) and mechanical properties of SMA samples were studied experimentally. Heat treatment at 1000°C for 60 min had the highest fraction of Cu<sub>3</sub>Al- β<sub>1</sub> phase (~83%). The hardness reached 283 HV for the A3-900-60 sample. FLDs dropped at low ARB cycles and then improved by increasing the number of cycles up to cycle 10. FT values had the same behavior until they reached the value of 61.2 MPa<sup>1/2</sup>.</p>

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Forming, Fracture and Mechanical Behavior of Cu-Al-Ag Shape Memory Composites

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Lingyuan Cui

摘要

In the present study, ultra-fine-grain Al/Cu/Ag shape memory alloys were fabricated via an accumulative roll bonding (ARB) process. The primary materials were pure Al, Cu and Ag particles. The Al content was 10 wt.% in all composites, while the Ag content was between 1 and 3 wt.%. After the fabrication of composite samples via ARB, all of Al/Cu/Ag composite samples were heat treated between 800 and 1100°C for 60 min and then were quenched to the ambient temperature. The influences of various Ag contents and heat treatment temperatures on the structural evolution of composite samples were investigated. Then, mechanical properties, fracture toughness (FT), forming limit diagram (FLDs) and mechanical properties of SMA samples were studied experimentally. Heat treatment at 1000°C for 60 min had the highest fraction of Cu3Al- β1 phase (~83%). The hardness reached 283 HV for the A3-900-60 sample. FLDs dropped at low ARB cycles and then improved by increasing the number of cycles up to cycle 10. FT values had the same behavior until they reached the value of 61.2 MPa1/2.