CAJ | 학술논문

通过拉伸试验、动态力学分析(DAM)和球差电镜研究固溶时效处理对 Ti?55.06%Ni?0.3%Cr(摩尔分数)合金的显微组织、力学性能和内耗性能的影响。结果表明：析出Cr3Ni2相粒子的时效态合金的抗拉强度和硬度总大于无Cr3Ni2析出的固溶态合金，时效峰温度为375°C。固溶态和375°C时效合金的内耗峰值(tanδ)均随频率的增加而降低，降温过程出现奥氏体(B2)→预马氏体相(R)和 R→马氏体(M)两个相变内耗峰；升温过程中由于 R 和M相变的叠加，两种状态合金均只出现一个M→B2相变内耗峰。此外，由375°C时效态合金析出的Cr3Ni2相粒子导致的基体中Cr、Ni含量降低，晶格畸变程度减弱，相变阻力减小，使得375°C时效态合金的内耗峰峰温向高温方向移动。
통과랍신시험、동태역학분석(DAM)화구차전경연구고용시효처리대 Ti?55.06%Ni?0.3%Cr(마이분수)합금적현미조직、역학성능화내모성능적영향。결과표명：석출Cr3Ni2상입자적시효태합금적항랍강도화경도총대우무Cr3Ni2석출적고용태합금，시효봉온도위375°C。고용태화375°C시효합금적내모봉치(tanδ)균수빈솔적증가이강저，강온과정출현오씨체(B2)→예마씨체상(R)화 R→마씨체(M)량개상변내모봉；승온과정중유우 R 화M상변적첩가，량충상태합금균지출현일개M→B2상변내모봉。차외，유375°C시효태합금석출적Cr3Ni2상입자도치적기체중Cr、Ni함량강저，정격기변정도감약，상변조력감소，사득375°C시효태합금적내모봉봉온향고온방향이동。
The effects of solution-aging treatment on the microstructures, mechanical properties and internal friction of Ti? 55.06%Ni?0.3%Cr (mole fraction) alloy were investigated by means of tensile test, dynamic mechanical analysis (DMA) and spherical aberration electron microscopy (SAEM). The results show that the aged alloys with Cr3Ni2 phase always exhibit higher tensile strength and hardness than those of solution-treated alloy without Cr3Ni2 phase, and the aging peak temperature presents at 375 °C. It is also found that the internal friction peak (tanδ) value decreases with increasing the frequency. There are two internal friction peaks corresponding to theB2(austenite)→R andR→M(martensite) transformations upon cooling, but only one corresponding to the reverseM→B2 transformation upon heating in both solution-treated and 375 °C-aged alloys, due to the superposition ofM andR phase transformation. Besides, the position of internal friction peaks in the alloy after aging at 375 °C shifts to higher temperature. This is attributed to the decrease of Cr and Ni content, and the decline of lattice deformation and transformation resistance, all of which are related to the precipitation of Cr3Ni2 phase in the solution-aged alloys.