It is very difficult by heat treatment to improve the precipitation character of carbide and reduce their brittle effect.

利用热处理手段来改善碳化物的析出特征，大幅度降低其脆化效果还较为困难。

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Therefere it is considered that in the si crystals adopted and the heat treatment used in the experiment, the homogeneous nucleation may be the leading form of the oxygen precipitation.

因此认为，对所采用的硅单晶在具体工艺条件下，氧沉淀是以均匀成核为主。

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These precipitation-hardened aluminum alloys gain their high strengths through heat treatment involving a severe quenching operation, which introduces a very high level of residual stresses.

航空铝合金为了获得高强韧性，必须进行固溶与时效处理，在淬火过程中产生很大的淬火残余应力。

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