LightMAT 2023
Lecture
21.06.2023
Understanding and Controlling Discontinuous Precipitation in Magnesium Alloys
JGJiaxuan Guo (Ph.D.)
The University of Manchester
Guo, J. (Speaker)¹; Davis, A.¹; Donoghue, J.¹; Lawson, M.¹; Robson, J.¹
¹University of Manchester
Magnesium-aluminium-zinc alloys such as AZ80 do not contain expensive Zr or rare earth elements and generally have good mechanical properties. The primary strengthening precipitate is plate-like β-Mg12Al17. Discontinuous precipitation, lamellar β-Mg12Al17, competes with continuous precipitation, and DP provides only limited strengthening. Cold deformation prior to ageing is one possible mechanism to suppress DP and promote CP. This study found that an essential role of the twins induced by cold deformation is directly blocking the DP growth front, which cannot cross the twin boundary.
Finally, it is shown in 3D that the structure of DP consists of an extensive interconnected network of β-Mg12Al17 phase, with individual β plates having complex branches and bends. The structure contains large gaps in all directions, consistent with the observed poor strengthening due to this phase.Abstract
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