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对Mg Li合金及液态反应合成MgO/Mg2 Si颗粒增强Mg Li基复合材料的室温和高温抗蠕变性能进行了研究。结果表明 ,复合材料的抗蠕变性能明显高于基体合金 ,室温时的蠕变速度仅为基体合金的 1/10 ,且随温度的升高效果更明显 ,160℃时的蠕变速度约为基体合金的 2 %。其机理为颗粒的存在提高了材料的屈服强度和弹性模量 ,以及颗粒限制晶界的相对滑动、阻碍位错的滑移及攀移、降低原子及空位的扩散速度
The room-temperature and high-temperature creep resistance of Mg-Li-based composites reinforced with MgO / Mg2Si particles synthesized by liquid-state reaction were studied. The results show that the creep resistance of the composites is obviously higher than that of the matrix alloy. The creep speed at room temperature is only 1/10 of that of the matrix alloy, and the effect is more obvious with increasing temperature. The creep speed at 160 ℃ is about 2% of base alloy. The mechanism is that the existence of particles increases the yield strength and elastic modulus of the material, as well as the relative sliding of the grain boundaries to the grain boundaries, hindering the slip and climbing of dislocations and reducing the diffusion speed of atoms and vacancies