基于快速热分析技术的Al基体中InSn合金液滴的凝固特性研究
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摘要
利用单辊旋淬法制备了镶嵌有大量纳米InSn合金液滴的铝合金薄带,并利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对合金薄带的物相组成和显微形貌进行了系统的表征。结果表明:薄带样品中InSn合金液滴有两种存在形式:一种是镶嵌在Al晶粒内部的大量纳米尺寸的InSn合金颗粒,另一种是分布于晶界的微米尺寸的InSn合金液滴。In和Sn发生共晶反应生成两种物相,分别是In_3Sn和InSn_4相。此外,利用快速热分析仪(FSC)研究了镶嵌在Al基体中InSn合金液滴的凝固及熔化特性。结果发现:单一吸热峰的温度接近于InSn共晶的熔化温度,在冷却过程中还存在一个放热峰,当冷却速率达到10~4K/s时,凝固过冷度最大为21 K。
Aluminum alloy ribbons in which a large number of nano-sized InSn alloy droplets was embedded were prepared by rotational quenching technique on a single roller. And the phase compositions and microstructures of the alloy ribbon were systematically characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM). The results showed that there were two kinds of In Sn droplets existed in the Al matrix: one was a large number of nano-sized InSn droplets embedded within the Al grains,and another was the micro-sized In Sn droplets distributed at the grain boundaries. In and Sn underwent eutectic reaction to form two phases,namely In_3Sn and InSn_4 respectively. In addition,the melting and solidification of InSn alloy droplets embedded in the Al matrix were studied by fast scanning calorimetry( FSC). It was found that the temperature of single endothermic peak was close to the melting temperature of the InSn eutectic alloy,and there existed an exothermic peak in the cooling process. The maximum undercooling degree of InSn droplets was 21 K when the cooling rate was 10~4 K/s.
Aluminum alloy ribbons in which a large number of nano-sized InSn alloy droplets was embedded were prepared by rotational quenching technique on a single roller. And the phase compositions and microstructures of the alloy ribbon were systematically characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM). The results showed that there were two kinds of In Sn droplets existed in the Al matrix: one was a large number of nano-sized InSn droplets embedded within the Al grains,and another was the micro-sized In Sn droplets distributed at the grain boundaries. In and Sn underwent eutectic reaction to form two phases,namely In_3Sn and InSn_4 respectively. In addition,the melting and solidification of InSn alloy droplets embedded in the Al matrix were studied by fast scanning calorimetry( FSC). It was found that the temperature of single endothermic peak was close to the melting temperature of the InSn eutectic alloy,and there existed an exothermic peak in the cooling process. The maximum undercooling degree of InSn droplets was 21 K when the cooling rate was 10~4 K/s.
引文
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[2]BONICELLI M G,CECCARONI G,GAUZZI F,et al.Solidification of metallic tin dispersed in phase[J].Thermochimica Acta,2005,430(1):95-99.
[3]LUCIC LAVCEVIC M,OGORELEC Z.Melting and solidification of Sn-clusters[J].Materials Letters,2003,57(26):4134-4139.
[4]CACCIUTO A,AUER S,FRENKEL D.Onset of heterogeneous crystal nucleation in colloidal suspensions[J].Nature,2004,428(6981):404-406.
[5]WANG C C,SMITH C S.Undercooling of minor liquid phases in binary alloys[J].The Journal of the Minerals,Metals&Materials Society,1950,188(1):136-138.
[6]MOORE K I,ZHANG D L,CANTOR B.Solidification of Pb particles embedded in Al[J].Acta Metallurgica et Materialia,1990,38(7):1327-1342.
[7]ZHAI W,WANG W,GENG D,et al.A DSC analysis of thermodynamic properties and solidification characteristics for binary Cu-Sn alloys[J].Acta Materialia,2012,60(19):6518-6527.
[8]ZHURAVLEV E,SCHICK C.Fast scanning power compensated differential scanning nano-calorimeter:1.The device[J].Thermochimica Acta,2010,505(1/2):1-13.
[9]GAO Y L,ZHURAVLEV E,ZOU C D,et al.Calorimetric measurements of undercooling in single micron sized SnAgCu particles in a wide range of cooling rates[J].Thermochimica Acta,2009,482(1):1-7.
[10]YANG B,PEREPEZKO J H,SCHMELZER J W,et al.Dependence of crystal nucleation on prior liquid overheating by differential fast scanning calorimeter[J].Journal of Chemical Physics,2014,140(10):104513.
[11]LI L F,YANG B,ZHAO B G,et al.Rapid solidification behavior of nano-sized Sn droplets embedded in the Al matrix by nanocalorimetry[J].Materials Research Express,2014,1(4):045012.
[12]LI L F,ZHAO B G,YANG B,et al.Nanocalorimetric characterization of the heterogeneous nucleation of rapidly solidified bismuth droplets embedded in a zinc matrix[J].Journal of the Minerals,Metals&Materials Society,2014,67(12):2881-2886.
[13]张全良,赵炳戈,张令,等.基于快速热分析技术Al基体中纳米Bi液滴凝固特性[J].上海金属,2017,39(6):50-54.
[14]CAKIR O,ALPAUT O.Thermodynamic properties of solid InSn alloys[J].Journal of the Less Common Metals,1988,141(1):11-27.
[15]WIERZCHOS J,ASCASO C.Application of back-scattered electron imaging to the study of the lichen-rock interface[J].Journal of Microscopy,1994,175(1):54-59.
[16]KIM W T,ZHANG D L,CANTOR B.Nucleation of solidification in liquid droplets[J].Metallurgical Transactions A,1991,22(10):2487-2501.
[17]TURNBULL D.Formation of crystal nuclei in liquid metals[J].Journal of Applied Physics,1950,21(10):1022-1028.
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