Light Metals 2014
Light Metals 2014
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2014年轻金属
DOI：
10.1002/9781118888438.ch159
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Bolzoni L
中科院分区：
文献类型：
--
作者：
Bolzoni L
减少污染的严格要求正在推动汽车工业采用轻质结构，因此，铝及其合金发挥着显着的作用。具有共晶或过共晶成分的Al-Si铸造合金通常用于生产高性能汽车产品，例如必须承受临界负载条件（即高温、高压和腐蚀性废气）的活塞和发动机缸体。在金属中，只要获得足够细的晶粒尺寸，就可以容易地获得足够的机械性能，但对于Al-Si铸造合金来说情况并非如此，其中基于Al-Ti-B三元系开发的商业晶粒细化剂由于硅对钛的毒化作用而非常无效。在这项工作中，一种新的晶粒细化剂的性能，在布鲁内尔大学开发的粉末添加的形式，它可以有效地和可靠地细化铝硅合金，进行了评估。特别地，这种新型晶粒细化剂的添加对二元过共晶和商业Al-Si合金的显微组织特征的影响进行了研究。
The stringent requirements for pollution reduction are pushing the automotive industry towards the employment of lightweight structures and, therefore, aluminium and its alloys play a remarkable role. Al-Si casting alloy with eutectic or hypereutectic compositions are, normally, employed for the production of high performance automotive products such as pistons and engine blocks which have to withstand critical loading conditions (i.e. high temperature, high pressure and corrosive exhaust gases). In metals, adequate mechanical properties can be easily obtained providing that a sufficiently fine grain size is achieved but this is not the case for Al-Si cast alloys where commercial grain refiner developed on the base of the Al-Ti-B ternary system are highly ineffective due to the poisoning effect of silicon on titanium. The performance of a novel grain refiner in the form of powder addition developed at Brunel University, which can efficiently and reliably refine Al-Si alloys, are assessed in this work. Particularly, the effect of the addition of this novel grain refiner on the microstructural features of both binary hyper-eutectic and commercial Al-Si alloys is studied.