Design, fabrication and characterization of porous Ti-rich Ti-Ni alloy based composites with near-zero thermal expansion behavior
Design, fabrication and characterization of porous Ti-rich Ti-Ni alloy based composites with near-zero thermal expansion behavior
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DOI：
10.1051/matecconf/20153303014
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
X. Ma;Junping Luo;S. Cao;Xin-Ping Zhang
中科院分区：
文献类型：
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作者：
X. Ma;Junping Luo;S. Cao;Xin-Ping Zhang
采用粉末冶金和两步设计相结合的方法，制备了具有近零热膨胀行为的微米级碳化硅颗粒增强多孔富钛钛镍合金基复合材料。首先调节Ni浓度以拓宽多孔Ti-Ni合金的负热膨胀(NTE)温度范围，然后引入不同量的微米级碳化硅颗粒，并与具有最佳原子比的钛镍混合粉末进行共烧，以获得具有良好热膨胀性能的碳化硅/钛镍复合材料。结果表明，逆马氏体相变与NTE温度范围有明显的相关性。在114.08~131.50℃温度范围内，12wt.%SiC/Ti-43.8at.%Ni复合材料的热膨胀系数很低，为-0.976×10−6K−1。研究表明，该热膨胀系数来源于伴随着Ti-Ni相变的体积变化。
Porous Ti-rich Ti-Ni alloy based composites with near-zero thermal expansion (NZTE) behaviour tailored by micro-sized SiC particles were fabricated using powder metallurgy and a two-step designing strategy. At first, the Ni concentration was tuned to broaden the temperature range of negative thermal expansion (NTE) of porous Ti-Ni alloys; then micro-sized SiC particles of different amounts were introduced and co-sintered with mixed Ti and Ni powders having an optimized atomic ratio so as to obtain SiC/Ti-Ni composites with desirable thermal expansion performance. Results show that there is a clear correlation between the reverse martensitic transformation and NTE temperature range. The porous 12wt.%SiC/Ti-43.8at.%Ni composite exhibits very low coefficient of thermal expansion (CTE) of -0.976×10 −6 K −1 from 114.08 to 131.50 °C. It is proposed that the NTE behavior originates from the volume change accompanying the phase transition of the Ti-Ni matrix, and the NZTE performance of SiC/Ti-Ni composites is attributed to the combination of the NTE produced by the alloy matrix and the positive thermal expansion provided by the SiC phase.