As a part of the systematic investigation on phase relationships of Zn-Al based alloys containing Cu and/or Si, the equilibrium phase transformations of the quaternary Zn-Al-Cu-Si system at 285℃ were investigated by using X-ray diffracti on, scanning electron microscopy and electron probe microanalysis techniques. A five-phase of (α+β+εT'+σ) and a four- phase of (β+ε+η+σ) were detected separately coexisting in the Zn-Al-Cu-Si system at 285℃. Then the 285℃ isothermal section of Zn-Al-Cu-Si system (with 0.1% -Si content) was established, and an equilibrium reaction was determined at 286℃ as the following pattern, β+T'=α+ε
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