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实验研究发现,添加微量稀土(0.5wt％)显著提高铂的强度。原子半径反常大的Eu和Yb使基体强度增加最大,重稀土铂合金的强度一般高于轻稀土合金。在1400℃以下,铂—稀土合金(以下简称Pt—RE) 具有优良的范性(断面收缩率ψ随原子序数的变化呈U形变化),重稀土铂合金的ψ值大于轻稀土合金。第二相硬化是所有Pt—RE强化的主要原因。
Experimental study found that the addition of trace rare earth (0.5wt%) significantly increased the intensity of platinum. The large atomic anomalies of Eu and Yb make the matrix strength increase most, and the strength of the heavy rare earth platinum alloy is generally higher than that of the light rare earth alloy. At 1400 ℃, the platinum-rare earth alloy (hereinafter referred to as Pt-RE) has an excellent performance (the reduction of area ψ varies with the change of atomic number) and the value of ψ of heavy rare earth alloy is larger than that of light rare earth alloy. The second phase hardening is the main reason for all the strengthening of Pt-RE.