Remarkable improvement of recovery stress of Fe–Mn–Si shape memory alloy fabricated by equal channel angular pressing

✍ Scribed by Wei Zhang; Yu-Hua Wen; Ning Li; Shu-Ke Huang

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 333 KB
• Volume: 454-455
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.10.101

✦ Synopsis

Effects of equal channel angular pressing and subsequent annealing temperature on the recovery stress of Fe-19.04Mn-4.98Si-8.50Cr-4.59Ni alloy were studied. The results show the maximum recovery stress σ m and the room recovery stress σ r of the as-pressed specimen increase firstly and then decrease with increase of annealing temperature. σ m and σ r of the as-pressed specimens annealed at optimal temperature 873 K are 260 MPa and 261 MPa higher than that of the as-quenched ones, respectively. The reason is that as-pressed alloys have higher yield strength and lower M s temperature, suppressing the plastic deformation and the ␥ → phase transformation induced by the recovery stress in cooling.