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Enhancing elevated temperature strength of copper containing aluminium alloys by forming L12 Al3Zr precipitates and nucleating θ″ precipitates on them

机译:通过形成L12 Al3Zr析出物并在其上成核θ''析出物来提高含铜铝合金的高温强度

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摘要

Strengthening by precipitation of second phase is the guiding principle for the development of a host of high strength structural alloys, in particular, aluminium alloys for transportation sector. Higher efficiency and lower emission demands use of alloys at higher operating temperatures (200 °C-250 °C) and stresses, especially in applications for engine parts. Unfortunately, most of the precipitation hardened aluminium alloys that are currently available can withstand maximum temperatures ranging from 150-200 °C. This limit is set by the onset of the rapid coarsening of the precipitates and consequent loss of mechanical properties. In this communication, we present a new approach in designing an Al-based alloy through solid state precipitation route that provides a synergistic coupling of two different types of precipitates that has enabled us to develop coarsening resistant high-temperature alloys that are stable in the temperature range of 250-300 °C with strength in excess of 260 MPa at 250 °C.
机译:通过第二相的沉淀来强化是开发多种高强度结构合金,尤其是用于交通运输业的铝合金的指导原则。更高的效率和更低的排放要求在更高的工作温度(200°C-250°C)和应力下使用合金,尤其是在发动机零件的应用中。不幸的是,目前可用的大多数沉淀硬化铝合金可以承受150-200°C的最高温度。该极限由沉淀物的快速粗化的开始以及随之而来的机械性能的损失来设定。在本交流中,我们提出了一种通过固态沉淀途径设计Al基合金的新方法,该方法提供了两种不同类型沉淀物的协同耦合,这使我们能够开发在温度下稳定的耐粗化高温合金温度范围为250-300°C,在250°C时强度超过260 MPa。

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