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首页> 外文期刊>Acta Technica CSAV >Creep behaviour of discontinuous aluminium and aluminium alloy matrix composites: an overview part I: load transfer and threshold stress effects. strengthening of the composite matrix with additional fine incoherent particles
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Creep behaviour of discontinuous aluminium and aluminium alloy matrix composites: an overview part I: load transfer and threshold stress effects. strengthening of the composite matrix with additional fine incoherent particles

机译：不连续的铝和铝合金基复合材料的蠕变行为：概述部分I：载荷传递和阈值应力效应。额外的细微非相干颗粒增强复合基质

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摘要

An example of creep behaviour of a simple discontinuous aluminium matrix composite, namely Al-30 SiC{sub}p composite (p means particulate) processed by powder metallurgy is given. The creep behaviour is described phenomenologically. Anomalously high values of the apparent activation energy of creep and the apparent stress exponent of minimum creep strain rate are shown to follow from the true threshold stress decreasing with increasing temperature more strongly than the shear modulus. The threshold stress effect and the load transfer effect are discussed. The likely origin of the true threshold stress and, especially, of its strong temperature dependence is identified. Disappearance of the true threshold stress at high testing temperatures is interpreted in terms of transition from athermal to thermally activated detachment of dislocations from fine alumina particles in the composite matrix. Finally, the creep behaviour of discontinuous composites with aluminium matrix strengthened by additional fine particles is illustrated by some examples and briefly discussed. It is shown that specifically the oxide dispersion strengthening of aluminium matrix generally results in rather dramatic increase in creep strength of the composite as characterized by the minimum creep strain rate.
机译：给出了简单的不连续铝基复合材料，即通过粉末冶金处理的Al-30 SiC {sub} p复合材料（p表示颗粒）的蠕变行为的示例。蠕变行为从现象学角度进行描述。结果表明，随着温度的升高，真实的阈值应力比剪切模量降低得更大，因此蠕变的表观活化能和最小蠕变应变率的表观应力指数异常高。讨论了阈值应力效应和载荷传递效应。确定了真实阈值应力的可能起源，尤其是其强烈的温度依赖性。真实阈值应力在高测试温度下的消失是根据复合基体中氧化铝从细小氧化铝颗粒的位错的无热转变为热活化转变而解释的。最后，通过一些例子说明并简要讨论了铝基质不连续复合材料的蠕变行为，这些复合材料通过附加的细颗粒增强。结果表明，以最小蠕变应变速率为特征的铝基体的氧化物弥散强化通常会导致复合材料的蠕变强度显着提高。

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