Ｍｇ‐Ｙ‐Ｎｄ合金の時効特性および引張性質
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The effects of small amounts of Ce, Mischmetal (Mm), Nd and Zr additions on the age-hardenability of Mg–1.5%Y and Mg–9%Y alloys were investigated. The tensile test properties and creep behavior of the alloys were also examined. The addition of about 2% Ce or Mm to the Mg–1.5%Y alloy has no effect to improve its age-hardenability, but has the effect to increase the matrix hardness. The essential effect of 0.5% Zr addition is the grain refinement of the alloy. The addition of 2% Nd has a significant effect to increase age-hardening of the alloy due to the precipitation of Nd itself. The Nd addition also greatly improves the age-hardenability of the Mg–9%Y alloy due to the cooperative precipitation Nd and Y. The cast and T6-treated Mg–10%Y–2%Nd alloy was short-time tensile tested at 573 to 723 K at two different initial strain rates of 2.78 × 10−5 and 2.78 × 10−4 and creep-tested under the stresses of 5 to 50 MPa. All of the results are expressed by the equation, ε∞σn, where ε is the initial strain rate or steady creep strain, σ is the 0.2% yield stress or creep stress, and n is a constant of about 5 or more in the present alloy. The hot-rolled and T6-treated Mg–9%Y–2%Nd alloy was also short-time tensile tested at 623 to 773 K at various initial strain rates. The results obtained are also expressed by the same equation above, where n is about 6 at all the test temperatures, except about 4 at 773 K.
- 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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