Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 670; pp. 280 - 291
• Main Authors: Tang, Lingling, Zhao, Yonghao, Islamgaliev, R.K., Tsao, Chi Y.A., Valiev, R.Z., Lavernia, E.J., Zhu, Y.T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 18.07.2016
• Subjects: Deformation mechanisms; Ductility; ECAP; Equal channel angular pressing; Failure; Magnesium base alloys; Mg alloy; Microstructure; Networks; Spray forming; Strength; Strengthening; Ultra-fine grains; Strengthening; Mg alloy; Deformation mechanisms; ECAP; Ultra-fine grains; Spray forming
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2016.06.031

The relatively low strength and poor ductility of conventional AZ80 Mg alloys have been attributed to the limited number of independent slip systems, in combination with the formation of fragile eutectic β-Mg17Al12 networks at grain boundaries. In an effort to overcome these limitations, spray forming followed by equal channel angular pressing (ECAP) was employed to obtain a unique bi-modal microstructure: coarse grains were separated and surrounded by deformation networks consisting of ultrafine-grained Mg with an average grain size of 0.6µm and ellipsoidal shaped β-Mg17Al12 particles with sizes of 200–300nm. Tensile tests revealed the advantage of this structure: a yield strength of 235MPa combined with an elongation to failure of 14%; the values are significantly higher than those of their conventional counterparts (100MPa-12%, and 140 MPa-5%). The underlying strengthening and deformation mechanisms of this particular microstructure are discussed and analyzed.