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在高温镍基变形合金中,加入微量Mg元素,可使晶界中的连续条状碳化物变成不连续的块状,从而提高了蠕变应力指数n;并降低晶界扩散系数,提高其蠕变激活能;使晶界能和碳化物-基体的相界能降低,提高了界面结合力。这些因素抑制了晶界滑动,阻止了裂纹的产生和扩展,显著地改善了合金的蠕变性能和持久寿命。
In the high temperature nickel-based deformation alloy, adding a trace amount of Mg, can make the continuous strip of grain boundary into discontinuous block, thereby increasing the creep stress index n; and reduce the grain boundary diffusion coefficient, increase its Creep activation energy; so that the grain boundary and carbide - matrix phase boundary can be reduced to improve the interface bonding strength. These factors inhibit the grain boundary sliding, preventing the generation and expansion of cracks, significantly improve the alloy creep properties and long-life.