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在经典Fe-36Ni因瓦合金熔池中添加微量Ti元素,原位生成TiC。与传统因瓦合金相比,所得因瓦合金屈服强度和抗拉强度分别提高约10%,同时塑性和膨胀性能良好。透射电镜观察到合金中分布有几十到几百纳米的细小颗粒,这些颗粒形状近似球形或椭球形,与周围基体结合良好,根据相机常数与晶面间距之间的关系,判定其为TiC。TiC的吉布斯标准生成自由能较Ni3Ti更低。TiC强化因瓦合金的主要方式为Orowan强化。
In the classic Fe-36Ni Invar alloy melt pool added trace Ti element, TiC generated in situ. Compared with the traditional invar alloy, the resultant invar alloy yield strength and tensile strength were increased by about 10%, while good plasticity and expansion properties. Transmission electron microscopy shows the distribution of small particles of dozens to hundreds of nanometers in the alloy. These particles are spherical or ellipsoidal in shape and have a good bond with the surrounding matrix. The relationship between the camera constant and the interplanar distance is determined as TiC. The Gibbs standard of TiC generates less free energy than Ni3Ti. The main way TiC reinforces Invar is Orowan reinforcement.