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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Creep behaviour of ultrafine-grained oxide dispersion strengthened copper prepared by cryomilling
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Creep behaviour of ultrafine-grained oxide dispersion strengthened copper prepared by cryomilling

机译：低温铣削制备的超细氧化物弥散强化铜的蠕变行为

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摘要

The creep behaviour of ultrafine-grained (UFG) oxide dispersion strengthened (ODS) copper, containing 3 vol.% of yttrium and calcium oxides, respectively, was examined in the temperature interval of 500-700℃ at different deformation rates. Values of the Norton stress exponent n_(500℃) = 20 and n_(700℃) = 10 are near those of GlidCop (being essentially a alumina ODS Cu material). With two modifications introduced in this work, the creep behaviour can be described within the frame of the Rosler-Arzt diffusional creep model of thermally activated detachment of the grain boundary dislocations from the departure side of particles lying in or adjacent to grain boundaries. The relatively low values of around k ≈ 0.8 for both materials investigated give evidence for a strong interaction of grain boundary dislocations with the oxide particles and coincide nicely with k-values found for Y_2O_3 in the literature.
机译：在500-700℃的温度区间内，以不同的变形速率研究了分别含有3％（体积）的钇和氧化钙的超细颗粒（UFG）氧化物弥散强化（ODS）铜的蠕变行为。诺顿应力指数n_（500℃）= 20和n_（700℃）= 10的值接近GlidCop（基本上是氧化铝ODS Cu材料）的值。通过在这项工作中引入两个修改，蠕变行为可以在Rosler-Arzt扩散蠕变模型的框架内进行描述，该模型由晶界位错从位于或邻近晶界的粒子的出射侧热活化脱离。两种材料的相对较低的k≈0.8左右的值为晶界位错与氧化物颗粒之间的强相互作用提供了证据，并且与文献中针对Y_2O_3的k值很好地吻合。

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