50Ni30Cu20-xCox(x=2，4，6，at%)高熵高溫形狀記憶合金，并研究了Co含量對其微觀組織和力學(xué)性能的影響。結(jié)果表明，隨著Co含量增加，合金晶粒尺寸減小。合金在鑄態(tài)下主要由B19′和少量B2相組成，斷口組織富含B19′相，而B2相幾乎消失。增加Co含量和縮小試樣尺寸(d)顯著提升了合金的抗壓強(qiáng)度和塑性，在d=2 mm時(shí)，(TiZrHf)50-Ni30Cu14Co6合金表現(xiàn)出最佳綜合力學(xué)性能，抗壓強(qiáng)度為2142.39±1.8 MPa，塑性為17.31±0.3%。壓縮循環(huán)試驗(yàn)顯示，隨著壓縮應(yīng)變增加，(TiZrHf)50Ni30Cu14Co6合金的殘余應(yīng)變增大，但回復(fù)能力減弱。合金的超彈性回復(fù)能力不斷增強(qiáng)，超彈性回復(fù)率從1.36%增至2.12%，殘余應(yīng)變率從1.79%增至5.52%，彈性回復(fù)率從3.86%增至7.36%，總回復(fù)率從74.48%降至63.20%。;(TiZrHf)50Ni30Cu20-xCox(x=2, 4, 6, at%) high-entropy high-temperature shape memory alloys were fabricated by water-cooled copper crucible in a magnetic levitation vacuum melting furnace, and the effects of Co content on microstructure and mechanical properties were investigated. The results indicate that the grain size of the alloy decreases with increasing the Co content. In the as-cast state, the alloy consists primarily of the B19′ phase, with a trace of B2 phase. The fracture morphology is predominantly composed of the B19′ phase, whereas the B2 phase is nearly absent. Increasing the Co content or reducing the sample dimensions (d) markedly enhance the compressive strength and ductility of the alloy. When d=2 mm, the (TiZrHf)50Ni30Cu14Co6 alloy demonstrates the optimal mechanical properties, achieving a compressive strength of 2142.39±1.8 MPa and a plasticity of 17.31±0.3%. The compressive cyclic test shows that with increasing the compressive strain, the residual strain of the (TiZrHf)50Ni30Cu14Co6 alloy increases while the recovery ability declines. The superelastic recovery capability of the alloy is continuously enhanced. The superelastic recovery rate increases from 1.36% to 2.12%, the residual strain rate rises from 1.79% to 5.52%, the elastic recovery rate ascends from 3.86% to 7.36%, while the total recovery rate declines from 74.48% to 63.20%."/>