【摘要】 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。更多还原

【Abstract】 The effects of the addition of rare earth elements (La, Ce, Pr, Nd, Eu, Gd, Er, Yb, and Y) on high-temperature (1200～1500℃) tensiie strength and plasticity of platinum are investigated. It is found from experiment- tal results that the addition of rare earth elements (nominally containing 0.5 wt.%) can remarkably improve the properties of platinum. The strength of the matrix would be improved by adding Eu and Yb with abnomal large atomic radius. The strength of heavy rare earth-platinum alloys is generally higher than that of the light rare earth platinum alloys. Rare earth-platinum alloys have excellent plasticity at<1400℃. Reduction of area of heavy rare earthplatinum alloys is larger than that of the light rare earth-platinum alloys. The strengthenness of rare earth-platinum alloys is caused by second phase precipitate hardening.更多还原