Fe_(80)Si_9B_(11)非晶合金薄带热膨胀特性和结构弛豫分析  

Thermal Expansion Properties and Relaxation of Fe_(80)Si_9B_(11) Amorphous Alloy Ribbon

作　　者：李红[1] 孙克[1] 李艳萍[1] 石毅[1] 郭金花[1] 卢志超[1] 

机构地区：[1]中国钢研科技集团安泰科技股份有限公司技术中心,北京100081

出　　处：《金属功能材料》2010年第1期4-7,12,共5页Metallic Functional Materials

基　　金：国家科技支撑计划课题:高性能万吨级非晶带材关键技术开发及产业化

摘　　要：提出了采用推杆式热膨胀仪测试非晶合金薄带热膨胀特性的新方法。分析了Fe80Si9B11非晶薄带的热膨胀曲特性和非晶合金晶化过程。根据R.G.Zheng理论分析了结构弛豫中自由体积比变化,发现自由体积比曲线出现双峰。结合晶化前发生相分离的理论分析了这种变化的原因。分析表明:铁基非晶Fe80Si9B11晶化过程中先形成α-Fe(Si)相,再析出Fe3B、二次α-Fe(Si)相。晶化前先发生相分离,自由体积比增大,然后析出结晶相α-Fe(Si),自由体积比降低。随温度升高,B偏聚,自由体积比增大,随后析出Fe3B、二次α-Fe(Si)相,自由体积比降低。To understand the structure relaxation of Fe80Si9B11 amorphous alloy, a new method to measure the ther- mal expansion properties of amorphous alloy ribbon with push-bar thermal dilatometer was applied. The free-volume fraction during crystallization was analyzed according to the change of linear expansion coefficients. The free-volume fraction curves showed two peaks. It was analyzed by phase disengagement theory. It is concluded that a-Fe（Si） phase crystallizes firstly and then Fe3B and secondary a-Fe（Si） phase crystallize. During relaxation, phase disen- gagement appears firstly before crystallization with free-volume increasing, then a-Fe（Si） crystallizes with free-vol- ume decreasing. At higher temperature, B partially polymerizes with free-volume increasing, and then Fe3 B and sec- ondary a-Fe（Si） crystallize with free-volume decreasing.

关 键 词：铁基非晶薄带 热膨胀系数 自由体积比 结构弛豫 

分 类 号：TG139.8[一般工业技术—材料科学与工程]