Gamma-phase influence on shape memory properties in Ni-Mn-Co-Ga-Gd high-temperature shape memory alloys
来源期刊：Acta Metallurgica Sinica2018年第5期
论文作者：Wei Zhang Xin Zhang Qian Wang Qing-Suo Liu
文章页码：471 - 476
摘 要：The effect of γ-phase on two-way shape memory effect（TWSME） of polycrystalline Ni56Mn25-xCoxGa18.9Gd0.1 alloys was investigated. The results show that an appropriate amount of ductile γ-phase significantly enhances the TWSME. The largest TWSME of 1.4% without training is observed in Ni56Mn21Co4Ga18.9Gd0.1 alloy, and this value is increased to 2.0% after thermomechanical training. The as-trained TWSME decays over the first five thermal cycles and then reaches a stable value as the number of cycles further increasing. Only the degradation of 0.2% is observed after 100 thermal cycles. The better TWSME and thermal stability are ascribed to the stable extra stress field formed by the plastically deformed γ-phase.
Wei Zhang，Xin Zhang，Qian Wang，Qing-Suo Liu
School of Materials Science and Engineering, Tianjin University of Technology
摘 要：The effect of γ-phase on two-way shape memory effect（TWSME） of polycrystalline Ni56Mn25-xCoxGa18.9Gd0.1 alloys was investigated. The results show that an appropriate amount of ductile γ-phase significantly enhances the TWSME. The largest TWSME of 1.4% without training is observed in Ni56Mn21Co4Ga18.9Gd0.1 alloy, and this value is increased to 2.0% after thermomechanical training. The as-trained TWSME decays over the first five thermal cycles and then reaches a stable value as the number of cycles further increasing. Only the degradation of 0.2% is observed after 100 thermal cycles. The better TWSME and thermal stability are ascribed to the stable extra stress field formed by the plastically deformed γ-phase.
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