冷速对Cu_(70)Ni_(30)合金凝固结构的影响  

The Effects of Cooling Rate on Solidification Microstructure of Cu_(70)Ni_(30) Alloy

作　　者：梁永超 张跃红 于邦毅 周稳 LIANG Yongchao;ZHANG Yuehong;YU Bangyi;ZHOU Wen(College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, Chin)

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2018年第2期36-40,共5页Journal of Guizhou University:Natural Sciences

基　　金：贵州省科技合作计划项目资助(黔科合LH字[2015]7645号);贵州大学引进人才项目资助(贵大人基合字(2014)34号(自然科学))

摘　　要：采用分子动力学方法对Cu_(70)Ni_(30)合金在5种不同冷速下快速凝固过程进行了模拟研究。经过分析发现,1×1012K/s冷速下,双体分布函数第二峰有裂缝出现,说明形成了非晶态结构,而其它4种冷速下双体分布函数形成许多尖锐的峰,说明形成了晶态结构。1×1011K/s、1×1010K/s、5×109K/s三种冷速下的凝固结构,晶态键型和非晶态键型都在某一温度发生突变,三个温度依次为900 K、950 K、1000 K。这3个温度也是面心立方晶体(fcc)、体心立方晶体(bcc)和密排六方晶体(hcp)3种典型晶体团簇数目跃变的温度,对应于体系的结晶温度。最后采用三维画图演示了晶体团簇及非晶体团簇的区别。The rapid solidification process of Cu70Ni30 alloy was simulated by adopting molecular dynamics method at 5 different cooling rates. It is found that the split second peak is pronounced on pair distribution function at1×1012 K/s cooling rate indicating the formation of amorphous structure. The pair distribution function of the other4 cooling rates illustrates the distinct crystalline characteristics from many sharp peaks of curves. At a certain temperature,the crystal bond types and the amorphous bond types both have abrupt changes under solidification structure at 1×1011 K/s,1×1010 K/s and 5 × 109 K/s cooling rates. And three temperatures are 900 K,950 K,and 1000 K respectively. They are also the transition temperatures of three typical crystal clusters including face centered cubic（ fcc）,body centered cubic（ bcc） and hexagonal close packed（ hcp）,corresponding to the crystallization temperature of the systems. Finally,the differences between crystal clusters and amorphous clusters were demonstrated by three-dimensional drawing.

关 键 词：分子动力学模拟 不同冷速 晶体结构 非晶结构 

分 类 号：O073[理学]