The important class of grain boundary (GB) complexions includes the few nanometer thick layers having composition which strongly differs from that of the abutting grains. Such GB complexions are frequently called intergranular films (IGFs) and can be observed close to the lines of wetting, prewetting and premelting complexion transitions in the bulk phase diagrams. In the majority of systems, the direct transition between complete and partial GB wetting takes place (by changing temperature, pressure, etc.). However, in certain conditions the so-called pseudopartial (or pseudoincomplete, or frustrated complete) GB wetting appears in a phase diagram between complete and partial wetting. In case of pseudopartial GB wetting, the thin GB layer of a complexion (IGF or 2-D interfacial phase) can coexist with large droplets (or particles) of the wetting phase with a non-zero dihedral (contact) angle. Thus, such IGFs can be observed in the two-phase (or multiphase) fields of bulk phase diagrams, in the broad intervals of concentrations, temperature and/or pressure. The IGFs driven by the pseudopartial GB wetting can drastically modify the properties of polycrystals. In this review, we discuss this phenomenon for the technologically important Fe–Nd–B-based hard magnetic alloys, WC–Co cemented carbides and Al-based light alloys.

一类重要的晶界（GB）肤色包括几纳米厚的层，其组成与邻接晶粒的组成有很大不同。这种GB肤色通常被称为晶间膜（IGF），可以在本体相图中接近润湿，预润湿和预融化的肤色过渡线观察到。在大多数系统中，完全和部分GB润湿之间发生直接过渡（通过改变温度，压力等）。但是，在某些情况下，所谓的伪局部（或伪不完全或受挫完全）GB浸润出现在完全浸润和部分浸润之间的相图中。如果是伪局部GB润湿，肤色薄的GB层（IGF或2-D界面相）可以与润湿相的大液滴（或颗粒）以非零二面角（接触角）共存。因此，可以在本体相图的两相（或多相）场中，在较宽的浓度，温度和/或压力区间内观察到这种IGF。由伪部分GB润湿驱动的IGF可以极大地改变多晶的性能。在这篇综述中，我们讨论了技术上重要的Fe–Nd–B基硬磁合金，WC–Co硬质合金和Al基轻合金的这种现象。由伪部分GB润湿驱动的IGF可以极大地改变多晶的性能。在这篇综述中，我们讨论了技术上重要的Fe–Nd–B基硬磁合金，WC–Co硬质合金和Al基轻合金的这种现象。由伪部分GB润湿驱动的IGF可以极大地改变多晶的性能。在这篇综述中，我们讨论了技术上重要的Fe–Nd–B基硬磁合金，WC–Co硬质合金和Al基轻合金的这种现象。