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首页> 外文期刊>Journal of Materials Science >Combustion synthesis/quasi-isostatic pressing of TiC0.7-NiTi cermets: microstructure and transformation characteristics
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Combustion synthesis/quasi-isostatic pressing of TiC0.7-NiTi cermets: microstructure and transformation characteristics

机译：TiC0.7-NiTi金属陶瓷的燃烧合成/准等静压：组织和转变特性

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TiC0.7-NiTi cermets were produced by combustion synthesis followed by quasi-isostatic consolidation while the reaction products were still hot and ductile. The TiC0.7-NiTi cermets were characterized by differential scanning calorimetry, room temperature transmission electron microscopy (TEM), and in-situ TEM (temperature varied during observation). The matrix of the as-synthesized 20NiTi, 40NiTi, and 60NiTi composites contains both R and B19' martensites at room temperature. No distinct R-phase morphology could be imaged. In the B19' martensite, [011] Type II twinning, (111) Type I twinning and (001) compound twinning modes were observed as the lattice invariant shear (LIS) of the R-B19' transformation. The [011] Type II twinning is often reported as the LIS of the B2- B19' transformation, but this is the first experimental confirmation of its predicted presence as a qualified LIS of the R-B19' transformation. The (001) compound twinning mode is responsible for the fine structure of the martensite with a wavy morphology. Nanoscale structures with a thickness of 5 nm were obtained inside the twins. Twinning was also observed at the interface with carbide particles, which confirms that some stress relaxation of the elastic mismatch occurs. At room temperature, the matrix of the 80NiTi composite had the R-phase structure, which appeared with a needle-like morphology. Thermal cycling resulted in the suppression of the R-phase transformation. This is the opposite of the behavior observed in un-reinforced NiTi alloys.
机译：TiC0.7-NiTi金属陶瓷是通过燃烧合成然后进行准等静压固结来生产的，而反应产物仍然是热的和易延展的。 TiC0.7-NiTi金属陶瓷的特征在于差示扫描量热法，室温透射电子显微镜（TEM）和原位TEM（观察过程中温度变化）。合成后的20NiTi，40NiTi和60NiTi复合材料的基质在室温下同时包含R和B19'马氏体。没有独特的R相形态可以成像。在B19'马氏体中，观察到[011] II型孪生，（111）I型孪生和（001）复合孪生模式是R-B19'转变的晶格不变剪切（LIS）。 [011] II型孪晶通常被报道为B2- B19'转化的LIS，但这是对它作为R-B19'转化的合格LIS的预测存在的第一个实验证实。 （001）复合孪晶模式负责具有波形形态的马氏体的精细结构。在双胞胎内部获得了厚度为5nm的纳米级结构。在与碳化物颗粒的界面处还观察到孪晶，这证实了弹性失配的一些应力松弛发生。在室温下，80NiTi复合材料的基体具有R相结构，呈针状形态。热循环导致R相转变的抑制。这与在未增强的NiTi合金中观察到的行为相反。

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