Ｍｇ‐Ｌｉ‐Ａｌ‐Ｃａ系合金の半溶融成形加工
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概要
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An attempt was made to apply semi-solid forming process to Mg–Li–Al and Mg–Li–Al–Ca alloys. 5 mass% (α phase matrix), 9 mass% (α+β eutectic matrix) and 14 mass% (β phase matrix) of Li were chosen to find the optimum Li content for semi-solid forming of Mg–Li–Al alloys. Al as a hardening element and Ca for protecting the combustion of the melt were added, respectively by 1 or 3 mass% and 1 or 2 mass.%, to the Mg–Li base alloys. Microstructural changes at the solidification range were preliminarily investigated in strain-introduced specimens. The press forming was then conducted at the optimum semi-solid temperature and the tensile properties were evaluated. Dendrite arms of the α phase break up into fine spherical particles when α specimen containing calcium is heated to its semi-solid temperature. Furthermore, an increment in the amount of introduced strain decreases the diameter of solid particles in the calcium-added Mg–9 mass%Li and 14 mass%Li alloys. These strain-introduced alloys containing calcium show fine and spherical solid particles distributed uniformly throughout the formed specimen when heated to the semi-solid temperature and then press-formed. The semi-solid formed specimens indicate a superior rise in tensile strength, especially in the case of Mg–9 mass%Li–3 mass%Al alloys which have a high tensile strength of 200 MPa and an elongation of more than 20%.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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