Recent advances in grain refinement of light metals and alloys

By M. Easton, M. Qian, A. Prasad, D. StJohn. 2016

284 citations recorded by the source corpus.

Grain refinement leads, in general, to a decreased tendency to hot tearing, a more dispersed and refined porosity distribution, and improved directional feeding characteristics during solidification. Reduced as-cast grain size can also lead to improved mechanical properties and wrought processing by reducing the recrystallized grain size and achieving a fully recrystallized microstructure. It is now well established that the two key factors controlling grain refinement are the nucleant particles including their potency, size distribution and particle number density, and the rate of development of growth restriction, Q, generated by the alloy chemistry which establishes the undercooling needed to trigger nucleation events and facilitates their survival. The theories underpinning our current understanding of nucleation and grain formation are presented. The application of the latest theories to the light alloys of Al, Mg and Ti is explored as well as their applicability to a range of casting and solidification environments. In addition, processing by the application of physical processes such as external fields and additive manufacturing is discussed. To conclude, the current challenges for the development of reliable grain refining technologies for difficult to refine alloy systems are presented.

Subfields: Aerospace Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/7fae7aa5ea33c838473e5841b0cc14d1630e21e9

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

1. R. Miranda
2. J. P. Oliveira
3. Telmo G. Santos

In Materials Chemistry

1. V. Duarte
2. T. A. Rodrigues
3. R. Miranda
4. J. P. Oliveira
5. Telmo G. Santos

In Mechanical Engineering

1. J. P. Oliveira
2. Telmo G. Santos
3. R. Miranda
4. V. Duarte
5. T. A. Rodrigues

Citations in the corpus

• Current Status and Perspectives on Wire and Arc Additive Manufacturing (WAAM) (2019, background): “A deep understanding of the mech nisms of nucleation with ino ulants and grain growth, as well as the challe ges for its use in additive manufacturing, is well described in [43].”