(東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004)
摘 要: 利用組織分析方法和X射線衍射分析，研究了Al-Zn對稱成分Spinodal分解合金的組織、結(jié)構(gòu)與成分。結(jié)果表明，Al-Zn對稱成分合金經(jīng)固溶處理后可獲得單相組織，但該組織在室溫下將發(fā)生Spinodal分解和Zn的析出。在鋼模鑄造的快速冷卻條件下，該合金的相組成已經(jīng)接近于平衡態(tài)，但存在較多的缺陷和較大的成分不均勻性。利用實(shí)測晶格常數(shù)的方法可以近似確定Spinodal分解和不連續(xù)析出等高分散度兩相組織中富Al固溶體的相成分。
關(guān)鍵字: Spinodal分解； X射線衍射； 等體積百分?jǐn)?shù)； 不連續(xù)析出
spinodal Al-Zn alloy with symmetrical composition
（School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, P.R.China）
Abstract:Through microstructure analysis method and X-ray diffraction analysis, the microstructure, structure and phase composition of spinodal Al-Zn alloy with symmetrical composition were studied. The results show that the single-phase solid solution of Al-Zn alloys in equal volume fractions (EVF) can be obtained after solid solution treatment, but it will undergo spinodal decomposition and precipitation of Zn at room temperature. Under the condition of fast cooling of steel-die cast, the phase composition of this alloy has already reached its equilibrium state, although there are many defects and large heterogeneity in compositions. By the method of measuring crystalline lattice parameters, the phase composition in Al-rich solid solution of the two phases in high discreteness that are formed through spinodal decomposition and discontinuous precipitation can be determined approximately.
Key words: spinodal decomposition； X-ray diffraction； equal volume fractions； discontinuous precipitation
