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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.1; Jul 7-11, 2003; Leganes, Madrid, Spain >Alloy Development and Associated Dimensional Changes of Aluminium Alloys During Liquid Phase Sintering
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Alloy Development and Associated Dimensional Changes of Aluminium Alloys During Liquid Phase Sintering

机译：液相烧结铝合金的合金发展及相关尺寸变化

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摘要

The sintering behaviour and microstructural evolution of two aluminium alloys, of the 2XXX and 7XXX series, has been studied under, both, laboratory and industrial conditions. Quenching experiments from selected temperatures during the heating cycles, coupled with microstructural characterisation by Electron Microscopy, were used to investigate the gradual approach towards equilibrium of the alloys, from the as-pressed powder mixtures to the consolidated state after sintering. Differential Scanning Calorimetry was used to identify the reactions leading to the formation of liquid phases during sintering while the associated dimensional changes were determined by Dilatometry. The sinterability of these alloys and the development of necks between the solid aluminium particles is based upon the initial formation of transient liquid phases that favour the incorporation of alloying additions, followed by the development of permanent liquid phases, mainly containing Zn/Mg/Al and Cu/Al for the 7XXX and 2XXX series, respectively, leading to the densification of the alloys. A series of geometrically complex components with adequate dimensional tolerance and properties were industrially produced for an automotive application using the 2XXX series P/M Al alloy.
机译：已经在实验室和工业条件下研究了2XXX和7XXX系列两种铝合金的烧结行为和微观组织演变。在加热循环过程中从选定温度进行的淬火实验，再结合电子显微镜的微观结构表征，被用于研究从压制粉末混合物到烧结后固结状态的逐步实现合金平衡的方法。差示扫描量热法用于鉴定在烧结过程中导致液相形成的反应，而相关的尺寸变化由膨胀法确定。这些合金的可烧结性和固体铝颗粒之间的颈状发展是基于过渡液相的初步形成，该过渡液相有利于掺入合金添加剂，然后发展出主要包含Zn / Mg / Al和7XXX和2XXX系列的Cu / Al分别导致合金的致密化。使用2XXX系列P / M铝合金工业生产了一系列具有足够尺寸公差和性能的几何形状复杂的零件，用于汽车应用。

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