Isothermal section of the Cu–Mn–Si ternary system at 700 °C

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• 作者：Shuhong Liu ; Yong Du ; Chao Zhang ; Honghui Xu ; Baiyun Huang ; Jianlie Liang ; Yichun Zhou ; Feng Zheng ; Yiwei Li
• 关键词：Cu– ; Mn– ; Si system ; Phase diagram ; X-ray diffraction ; Scanning electron microscopy ; SEM
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：4 March 2010
• 年：2010
• 卷：492
• 期：1-2
• 页码：190-195
• 全文大小：1354 K

文摘

Isothermal section of the Cu–Mn–Si ternary system at 700 °C was investigated over the whole concentration range by means of X-ray diffraction, scanning electron microscopy equipped with energy dispersive X-ray analysis, and electron probe microanalysis. A new MgZn₂-type ternary compound T with an average composition of Cu_50.8Mn_36.3Si_12.9 (in at. % ) was observed, while two ternary compounds with approximate formulae of Cu_32.5Mn_50.2Si_17.3 and Cu_28.3Mn_60.5Si_11.2 reported in the literature were not found. The lattice parameters of the T phase were determined to be a = b = 4.83(6) and c = 7.846(7) Å. The binary compound Mn₅Si₂, the existence of which is controversial in the literature, was observed at 700 °C. Five three-phase equilibria, Mn₃Si + T + (Cu), Mn₅Si₃ + Mn₅Si₂ + T, Mn₅Si₃ + MnSi + γ-Cu₅₆Si₁₁, MnSi + Mn₁₁Si₁₉ + η-Cu₁₉Si₆, and Mn₁₁Si₁₉ + η-Cu₁₉Si₆ + (Si) were well determined. The solubilities of Cu in (βMn), Mn₆Si, Mn₉Si₂, Mn₃Si, Mn₅Si₂, Mn₅Si₃, MnSi and Mn₁₁Si₁₉ were determined to be 0.6, 0.8, 2.1, 1.5, 2.3, 2.5, 1.6 and 0.8 at. % Cu, respectively. The solubilities of Mn in γ-Cu₅₆Si₁₁ and η-Cu₁₉Si₆ were measured to be about 3.7 and 2.7 at. % Mn, respectively.