List of precipitation hardened alloys and shape of precipitate

S. No	Alloy	Precipitate	Shape	Reason for the shape	Reference
1	Inconel 718	Delta phase	Plate	To reduce strain energy (caused due to lattice miss fit, the b direction length is different from the matrix) it grows in plate like structure because	Mahadevan, S., Nalawade, S., Singh, J. B., Verma, A., Paul, B., & Ramaswamy, K. (2010). Evolution of δ phase microstructure in alloy 718. 7th International Symposium on Superalloy 718 and Derivatives 2010, 2, 737–750. https://doi.org/10.1002/9781118495223.ch57
2	Al–43%Zn-2%Cu	Zn	Ellipsoidal	Due coherent interface between Zn (0002) and Al (111)	Han, S. Z., Choi, E. A., Park, H. W., Lim, S. H., Lee, J., Ahn, J. H., Hwang, N. M., & Kim, K. (2017). Simultaneous increase in strength and ductility by decreasing interface energy between Zn and Al phases in cast Al-Zn-Cu alloy. Scientific Reports, 7(1), 1–8. https://doi.org/10.1038/s41598-017-12286-7
3	Al-3.1Ni-0.15Zr	Al3Zr	Spherical	_	Pandey, P., Makineni, S. K., Gault, B., & Chattopadhyay, K. (2019). On the origin of a remarkable increase in the strength and stability of an Al rich Al-Ni eutectic alloy by Zr addition. Acta Materialia, 170, 205–217. https://doi.org/10.1016/j.actamat.2019.03.025
4	Al-Ag	Ag2Al	Spherical	Due to no large difference in the atomic radius of aluminium and Silver.	Modern Physical Metallurgy and Materials Engineering. (1999). Elsevier. https://doi.org/10.1016/B978-0-7506-4564-5.X5000-9
5	Al-Cu	CuAl2	Plate	High Misfit in Solvent lattice leads to formation of plate like structure	Modern Physical Metallurgy and Materials Engineering. (1999). Elsevier. https://doi.org/10.1016/B978-0-7506-4564-5.X5000-9
6	Al-Mg-Si	Mg2Si	Plate	Misfit in lattice as Mg atom is bigger than Aluminium	Modern Physical Metallurgy and Materials Engineering. (1999). Elsevier. https://doi.org/10.1016/B978-0-7506-4564-5.X5000-9

 

                   Table1: List of precipitation hardened alloys