先进材料疑固实验室 Solidification of peritectics Laboratory of Advanced Materials Solidification Normal growth speed: A quenched peritectic microstructure observed in Sn- 1000 900 bronze,with the B-phase 800 completely surrounding the 700 primary a-phase. 600 10 20 30 Cs [wt6] (a)Cu-Sn phase dingram (b)Cu-Sn microstructure A micrograph of Fe-50wt%Au 1400 alloy with the peritectic phase 1200 has the same crystal structure as the primary phase.The 1000 primary y-phase solidifies first 800 and thin layer y'-phase forms 204060C. 10m around y. (e)Fe-Au phase diagram (d)Fe-Au mierostructure Fig.9.27 Examples of peritectie microstructures and their associated phase dia. grams:(a)The Cu-Sn phase diagram and (b)mierostructure observed in a quenched Cu-20wt%Sn specimen [19).(c)The Fe-Au phase diagram and (d) mierostructure in a quenched Fe-50wt Au specimen.(Courtesy,D.Favez.) 上游文通大学 SHANGHAI JIAO TONG UNIVERSITYSolidification of peritectics Normal growth speed: A quenched peritectic microstructure observed in Sn￾bronze, with the β-phase completely surrounding the primary α-phase. A micrograph of Fe-50wt%Au alloy with the peritectic phase has the same crystal structure as the primary phase. The primary γ-phase solidifies first and thin layer γ’-phase forms around γ