Al-Cu-Mg合金中时效相S′的二次衍射效应研究

本文利用透射电镜研究了Al-Cu-Mg合金中S′相及S相在铝基体基本带轴上的复合衍射花样。选区衍射表明,由S′相相对于铝基体存在的12种变体及其二次衍射效应构成了复合衍射图。铝基体112]带轴的近似三等分点是由S′相的914]带轴及二次衍射造成,并与S’相的<101>、<110>强衍射构成了复合衍射花样;铝基体111]带轴主要由S′相的<514>强衍射构成;铝基体111]带轴主要由S′相的<013>和<021>强衍射构成。

STUDY ON DOUBLE DIFFRACTIONS OF S' PRECIPITATE PHASE IN Al-Cu-Mg ALLOY

The complex diffraction patterns of S'and S phase on typical aluminium matrix zones in Al-Cu-Mg alloy have been, studied by TEM. Selected area electron diffractions show that 12 variants of S'phase to aluminium matrix and double diffractions have caused the complex diffraction patterns. <013> and <021>of S'phase construct the complex pattern in 001] matrix one<914>,<101> and <110> of S'phase construct the complex pattern in 112] matrix zone; 514] of S'phase constructs the complex in 111]matrix zone.