Grain refinement of Al-Si9.8-Cu3.4 alloy by novel Al-3.5FeNb-1.5C master alloy and its effect on mechanical properties

2017 2nd International Conference on Functional Materials and Metallurgy

材料科学;冶金学

Apparao, K. Ch^1 ; Birru, Anil Kumar^1

Department of Mechanical Engineering, National Institute of Technology, Manipur

795004, India^1

关键词: Al-ti-b master alloys;    Aluminium cast alloys;    Average grain size;    Heterogeneous nucleation;    Inter-metallic particle;    Poisoning effects;    Strength and elongations;    Uniform microstructure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/303/1/012012/pdf
DOI  :  10.1088/1757-899X/303/1/012012

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A novel Al-3.5FeNb-1.5C master alloy with uniform microstructure was prepared using a melt reaction process for this study. In the master alloy, basic intermetallic particles such as NbAl3, NbC act as heterogeneous nucleation substrates during the solidification of aluminium. The grain refining performance of the novel master alloy on Al-Si9.8-Cu3.4alloy has also been investigated. It is observed that the addition of 0.1 wt.% of Al-3.5FeNb-1.5C master alloy can induce very effective grain refinement of the Al-Si9.8-Cu3.4alloy. The average grain size of α-Al is reduced to 22.90 μm from about 61.22 μm and most importantly, the inoculation of Al-Si9.8-Cu3.4alloy with FeNb-C is not characterised by any visible poisoning effect, which is the drawback of using commercial Al-Ti-B master alloys on aluminium cast alloys. Therefore, the mechanical properties of the Al-Si9.8-Cu3.4alloy have been improved obviously by the addition of the 0.1 wt.% of Al-3.5FeNb-1.5C master alloy, including the yield strength and elongation.