Title of article :
Revisiting the role of peritectics in grain refinement of Al alloys Original Research Article
Author/Authors :
Feng Wang، نويسنده , , Zhilin Liu، نويسنده , , Dong Qiu، نويسنده , , John A. Taylor، نويسنده , , Mark A. Easton، نويسنده , , Ming-Xing Zhang، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2013
Pages :
11
From page :
360
To page :
370
Abstract :
The grain refining effect of four peritectic-forming solutes (Ti, V, Zr and Nb) as well as three eutectic-forming solutes (Cu, Mg and Si) on pure Al was investigated. Significant grain refinement is observed by the addition of peritectic-forming solutes, whereas the addition of eutectic-forming solutes only slightly decreases the grain size. The mechanisms underlying the grain refinement of these alloys were then studied by a new analytical methodology for assessing grain refinement that incorporates the effects of both alloy chemistry and nucleant potency. It is found that the low degree of grain refinement by the addition of eutectic-forming solutes is mainly attributed to the segregating power of solutes, i.e. the constitutional undercooling contribution. However, peritectic-forming solutes do not only cause grain refinement by their segregation power but, more importantly, they introduce copious potent nuclei into the melt and promote significant grain refinement via heterogeneous nucleation.
Keywords :
Nucleant particles , Peritectics , Al alloys , Grain refinement mechanism , Growth restriction factor
Journal title :
ACTA Materialia
Serial Year :
2013
Journal title :
ACTA Materialia
Record number :
1146718
Link To Document :
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