材料导报
材料導報
재료도보
MATERIALS REVIEW
2009年
24期
13-16
,共4页
赵仲恺%周海涛%蒋永锋%李庆波%刘志超%温盛发
趙仲愷%週海濤%蔣永鋒%李慶波%劉誌超%溫盛髮
조중개%주해도%장영봉%리경파%류지초%온성발
Co_(65)Fe_4Ni_2Si_(15)B_(14)%非等温%晶化动力学%晶化激活能%Avrami指数
Co_(65)Fe_4Ni_2Si_(15)B_(14)%非等溫%晶化動力學%晶化激活能%Avrami指數
Co_(65)Fe_4Ni_2Si_(15)B_(14)%비등온%정화동역학%정화격활능%Avrami지수
Co_(65)Fe_4Ni_2 Si_(15)B(14)non-isothermal%crystallization kinetics%crystallization activation energy%Avrami exponent
采用差示扫描量热分析(DSC)和X射线衍射技术(XRD)研究了非晶态合金Co_(65)Fe_4Ni_2Si_(15)B_(14)的非等温晶化动力学.结果表明,初始晶化的晶化峰值温度T_p与升温速率β呈线性关系:T_p=11.49lnβ+795.43.采用Kissinger和Doyle-Ozawa方法计算了表观晶化激活能E_a,分别为471.68kJ/mol和461.50kJ/mol.进一步研究发现,该非晶合金的晶化为多阶段的连续形核直至饱和的过程;当进入稳定晶化阶段时,剩余非晶的局域晶化激活能逐渐下降,非晶基体的热稳定性降低,这是由B原子的高温扩散导致的.同时,局域Avrami指数n(α)也反映了不同晶化阶段的形核长大机制.
採用差示掃描量熱分析(DSC)和X射線衍射技術(XRD)研究瞭非晶態閤金Co_(65)Fe_4Ni_2Si_(15)B_(14)的非等溫晶化動力學.結果錶明,初始晶化的晶化峰值溫度T_p與升溫速率β呈線性關繫:T_p=11.49lnβ+795.43.採用Kissinger和Doyle-Ozawa方法計算瞭錶觀晶化激活能E_a,分彆為471.68kJ/mol和461.50kJ/mol.進一步研究髮現,該非晶閤金的晶化為多階段的連續形覈直至飽和的過程;噹進入穩定晶化階段時,剩餘非晶的跼域晶化激活能逐漸下降,非晶基體的熱穩定性降低,這是由B原子的高溫擴散導緻的.同時,跼域Avrami指數n(α)也反映瞭不同晶化階段的形覈長大機製.
채용차시소묘량열분석(DSC)화X사선연사기술(XRD)연구료비정태합금Co_(65)Fe_4Ni_2Si_(15)B_(14)적비등온정화동역학.결과표명,초시정화적정화봉치온도T_p여승온속솔β정선성관계:T_p=11.49lnβ+795.43.채용Kissinger화Doyle-Ozawa방법계산료표관정화격활능E_a,분별위471.68kJ/mol화461.50kJ/mol.진일보연구발현,해비정합금적정화위다계단적련속형핵직지포화적과정;당진입은정정화계단시,잉여비정적국역정화격활능축점하강,비정기체적열은정성강저,저시유B원자적고온확산도치적.동시,국역Avrami지수n(α)야반영료불동정화계단적형핵장대궤제.
The non-isothermal kinetics of amorphous alloy Co_(65)Fe_4 Ni_2Si_(15)B_(14) is investigated by differential Scanning calorimeter(DSC)and X-ray diffraction(XRD).The results show that there is a linear relationship between the peak temperature T_p(K)and heating rate β:T_p=11.49lnβ+795.43.The apparent crystallization activation energy E_a is calculated to be 471.68kJ/mol and 461.50kJ/mol by Kissinger and Doyle-Ozawa method,respectively.The crystallization of this amorphouS alloy is a multi-stage continuous nucleation up to saturation process.The local erystailization energy decreases gradually indicating that the thermal stability of the residual amorphous matrix becomes weak at the steady crystallization stage,which is ascribed to the diffusion of boron atoms at elevated temperatures.Meanwhile,the local Avrami exponent n(α)exhibits the nucleation and growth mechanism at different crystallization stages.