假定系统中不存在定向推动力的条件下，由于热振动而使质点不是沿着一定趋向跃迁而是一种无规则的迁移扩散过程，称为“无序扩散”。
本文采用一个简单模型，在仅计质量无序的情况下，由CPA方法讨论了超晶格中界面两侧原子的互扩散对其声子结构的影响。
With a simple model and only considering the mass disorder, we have discussed the effect of interface diffusion on the phonon structure of superlattices by means of CPA method.
粒子束辐照，将点缺陷引入合金，会对马氏体相变产生影响； 点缺陷和化学无序积累到一定程度，还会诱发扩散型晶体→非晶体转变。
Ion beam irradiation can affect the martensitic transformation and induce the amorphous transition by production, accumulation of defects and atomic disordering in alloys.
研究表明，扩散层具有随机性、无序性和自相似性等分形特性。
Research indicates that GDL have characteristics of randomness, irregularity and self - similarity.
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