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首页> 外文期刊>Materials Science and Engineering >Pressure dependence of age-hardenability of aluminum cast alloys and coarsening of precipitates during hot isostatic pressing
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Pressure dependence of age-hardenability of aluminum cast alloys and coarsening of precipitates during hot isostatic pressing

机译：热等静压过程中铝铸造合金时效性与析出物粗化的压力相关性

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摘要

The application of hot isostatic pressing is often mandatory to improve the fatigue resistance of aluminum cast alloys in order to meet the high quality requirements defined by automotive and aircraft industries. A pressure difference of 75 MPa between heat treatment and hot isostatic pressing affects the diffusivity and the precipitation kinetics. It is shown that the coarsening of precipitates during hot isostatic pressing is slower compared to the coarsening of precipitates during heat treatment. It is supposed that the high pressure within this densification process reduces the density of vacancies and therefore decreases the diffusivity of silicon and magnesium atoms, resulting in a lower critical cooling rate at which an oversaturated condition of dissolved silicon and magnesium atoms within the aluminum matrix can be achieved. Thus, quenching following hot isostatic pressing can be performed in slightly modified standard hot isostatic presses at lower cooling rates than quenching during standard heat treatment and even then does result in high age-hardenability of the alloy. It becomes possible to combine hot isostatic pressing and solution annealing within a single process step.
机译：为了满足汽车和飞机行业定义的高质量要求，通常必须强制使用热等静压以提高铝铸合金的抗疲劳性。热处理和热等静压之间的75 MPa压差会影响扩散率和析出动力学。结果表明，热等静压过程中沉淀物的粗化比热处理过程中沉淀物的粗化要慢。据推测，在这种致密化过程中的高压会降低空位的密度，从而降低硅和镁原子的扩散率，从而导致较低的临界冷却速率，在该速率下，铝基体内溶解的硅和镁原子的过饱和状态会降低取得成就。因此，热等静压后的淬火可以在比标准热处理期间淬火低的冷却速率下，在经过稍微修改的标准热等静压机中进行，并且即使这样也会导致合金的高时效淬透性。在单个处理步骤中将热等静压和固溶退火相结合成为可能。

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