Grain Refinement of an Al-2 wt%Cu Alloy by Al3Ti1B Master Alloy and Ultrasonic Treatment

4th International Conference on Advances in Solidification Processes

材料科学;物理学

Wang, E.Q.^1 ; Wang, G.^1 ; Dargusch, M.S.^1 ; Qian, M.^2 ; Eskin, D.G.^3 ; StJohn, D.H.^1

Centre of Advanced Materials Processing and Manufacturing (AMPAM), University of Queensland, School of Mechanical and Mining Engineering, St Lucia

QLD

4072, Australia^1

RMIT University, School of Aerospace, Mechanical and Manufacturing Engineering, Centre for Additive Manufacturing, GPO Box 2476, VIC

3083, Australia^2

BCAST, Brunel University, Uxbridge

UB3 PH, United Kingdom^3

关键词: Cu alloy;    Fine equiaxed grains;    Grain size;    Growth restriction;    Master alloys;    Ultrasonic treatments;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012050/pdf
DOI  :  10.1088/1757-899X/117/1/012050

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Both inoculation by AlTiB master alloys and Ultrasonic Treatment (UT) are effective methods of refining the grain size of aluminium alloys. The present study investigates the influence of UT on the grain refinement of an Al-2 wt% Cu alloy with a range of Al3TilB master alloy additions. When the alloy contains the smallest amount of added master alloy, UT caused significant additional grain refinement compared with that provided by the master alloy only. However, the influence of UT on grain size reduces with increasing addition of the master alloy. Plotting the grain size data versus the inverse of the growth restriction factor (Q) reveals that the application of UT causes both an increase in the number of potentially active nuclei and a decrease in the size of the nucleation free zone due to a reduction in the temperature gradient throughout the melt. Both these factors promote the formation of a fine equiaxed grain structure.