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The mechanism of grain growth and thermal stability in Ni-1 at.% Pb alloy

Author:
Chen, Z.   Tang, Y.Y.   Tao, Q.   Chen, Q.   Liang, T.  


Journal:
Journal of Alloys and Compounds


Issue Date:
2016


Abstract(summary):

Highlights

The effect of undercooling and annealing on the grain evolution was investigated.

The process of grain growth was categorized as three stages.

Slow growth → rapid growth stage → stable growth stage.

The process was influenced by solute segregation and precipitation formation.

Abstract

The effect of undercooling and subsequent annealing on the evolution of grain growth of Ni-1 at.% Pb alloy was investigated with the help of glass fluxing technique and isothermal annealing process. To investigate the mechanism of grain growth, isothermal annealing processes of the as-quenched samples at different undercoolings were conducted at different annealing temperatures. The whole process of grain size evolution could be rationally categorized as three stages: 1. The slow growth stage; 2. The rapid growth stage; 3. The stable growth stage. With the utilization of grain boundary energy σb model, it is shown that the stability in stage 1 is due to the reduction of σb. As a result of second phase precipitation occurring at 2–3 stages, rapid grain growth occurs.



Page:
628-633


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