The transformation behavior of Ni Ti Nb based alloys was analysed.The absence of R phase transformation in these alloys is related to the stress field in the NiTi matrix.The thermal mismatch stress was calculated by...The transformation behavior of Ni Ti Nb based alloys was analysed.The absence of R phase transformation in these alloys is related to the stress field in the NiTi matrix.The thermal mismatch stress was calculated by the Eshelby method in Ni Ti Nb alloys.The results show that the mean matrix elastic stress field is isostatic tensile,there is no preferred stress in [111] B 2 direction.The mean matrix stress from the thermal misfit between NiTi matrix and β Nb particle is too small to induce dislocations.All the factors tend to inhibit R phase transformation.展开更多
分析了含有 β Nb粒子的 Ni Ti Nb基形状记忆合金的临界屈服应力 ,研究了合金化元素对其临界屈服应力的影响。结果表明 ,Ni Ti Nb基形状记忆合金的临界屈服应力可用 Tresca屈服准则描述 ,其 ΔσTrans ΔT值应低于二元 Ni Ti合金 ,这一...分析了含有 β Nb粒子的 Ni Ti Nb基形状记忆合金的临界屈服应力 ,研究了合金化元素对其临界屈服应力的影响。结果表明 ,Ni Ti Nb基形状记忆合金的临界屈服应力可用 Tresca屈服准则描述 ,其 ΔσTrans ΔT值应低于二元 Ni Ti合金 ,这一理论分析与实验结果一致 ;V的微量加入能有效提高 Ni Ti Nb记忆合金的临界屈服应力。展开更多
文摘The transformation behavior of Ni Ti Nb based alloys was analysed.The absence of R phase transformation in these alloys is related to the stress field in the NiTi matrix.The thermal mismatch stress was calculated by the Eshelby method in Ni Ti Nb alloys.The results show that the mean matrix elastic stress field is isostatic tensile,there is no preferred stress in [111] B 2 direction.The mean matrix stress from the thermal misfit between NiTi matrix and β Nb particle is too small to induce dislocations.All the factors tend to inhibit R phase transformation.
文摘分析了含有 β Nb粒子的 Ni Ti Nb基形状记忆合金的临界屈服应力 ,研究了合金化元素对其临界屈服应力的影响。结果表明 ,Ni Ti Nb基形状记忆合金的临界屈服应力可用 Tresca屈服准则描述 ,其 ΔσTrans ΔT值应低于二元 Ni Ti合金 ,这一理论分析与实验结果一致 ;V的微量加入能有效提高 Ni Ti Nb记忆合金的临界屈服应力。
