The influence of cooling rate and Fe/Cr content on the evolution of Fe-rich compounds in a secondary Al-Si-Cu diecasting alloy

4th International Conference on Advances in Solidification Processes

材料科学;物理学

Fabrizi, A.^1 ; Timelli, G.^1

University of Padua, Department of Management and Engineering, Stradella S. Nicola, 3, Vicenza

36100, Italy^1

关键词: Branched structures;    Chinese script;    Cooling rates;    Die-casting alloy;    Experimental conditions;    Image analysis techniques;    Microstructural changes;    Morphological evolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012017/pdf
DOI  :  10.1088/1757-899X/117/1/012017

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This study investigates the morphological evolution of primary α-Al(Fe,Mn,Cr)Si phase in a secondary Al-Si-Cu alloy with respect to the initial Fe and Cr contents as well as to the cooling rate. The solidification experiments have been designed in order to cover a wide range of cooling rates, and the Fe and Cr contents have been varied over two levels. Metallographic and image analysis techniques have been used to quantitatively examine the microstructural changes occurring at different experimental conditions. The morphological evolution of the α-Fe phase has been also analysed by observing deep etched samples. By changing the cooling rate, α-Al15(Fe,Mn,Cr)3Si2dodecahedron crystals, as well as Chinese- script, branched structures and dendrites form, while primary coarse β-Al5(Fe,Mn)Si needles appear in the alloy with the highest Fe content at low cooling rates.