固溶时效处理对Ti-55.06%Ni-0.3%Cr合金组织和性能的影响.pdfVIP

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固溶时效处理对Ti-55.06%Ni-0.3%Cr合金组织和性能的影响.pdf

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固溶时效处理对Ti-55.06%Ni-0.3%Cr合金组织和性能的影响.pdf

Trans. Nonferrous Met. Soc. China 25(2015) 1865−1871 Effects of solution-aging treatment on microstructures and properties of Ti−55.06%Ni−0.3%Cr alloy Li-zhou ZENG, Bing-hui LUO, Bin LI, Zhen-hai BAI, Sheng OUYANG, Wen-li FAN School of Materials Science and Engineering, Central South University, Changsha 410083, China Received 13 July 2014; accepted 16 December 2014 Abstract: 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 Cr Ni phase always exhibit higher 3 2 tensile strength and hardness than those of solution-treated alloy without Cr Ni phase, and the aging peak temperature presents at 3 2 375 °C. It is also found that the internal friction peak (tan δ) value decreases with increasing the frequency. There are two internal friction peaks corresponding to the B2(austenite)→R and R→M(martensite) transformations upon cooling, but only one corresponding to the reverse M→B2 transformation upon heating in both solution-treated and 375 °C-aged alloys, due to the superposition of M and R 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 C