کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1451355 | 988770 | 2005 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Microstructure control and ductility improvement of La–Al–(Cu, Ni) composites by Bridgman solidification Microstructure control and ductility improvement of La–Al–(Cu, Ni) composites by Bridgman solidification](/preview/png/1451355.png)
Microstructure evolutions were experimentally studied as a function of growth velocity and alloy composition in LaxAl14(Cu, Ni)86 − x alloys (x = 57–74). The composition–velocity ranges were determined for the formation of eutectic, amorphous, eutectic + compound, amorphous + dendrite, and eutectic + dendrite. A skewed eutectic coupled zone was found towards the compound phase. A composite structure composed of ductile La dendrites in a matrix of either eutectic or amorphous phase can be produced in hypoeutectic alloys. Compressive tests were performed on amorphous/dendrite and eutectic/dendrite composites. As the volume fraction of dendrites increases, fracture strength linearly decreases and obeys a rule-of-mixtures relationship, whereas plastic strain exhibits an exponential increase. Optimised mechanical properties can be realized through both alloy composition design and well-controlled solidification processing.
Journal: Acta Materialia - Volume 53, Issue 9, May 2005, Pages 2607–2616