Ti-(44-50)Al合金定向包晶凝固过程中的组织演化  

MICROSTRUCTURE EVOLUTION OF Ti-(44-50)Al ALLOYS DURING DIRECTIONAL PERITECTIC SOLIDIFICATION

作　　者：刘畅[1] 苏彦庆[1] 李新中[1] 郭景杰[1] 贾均[1] 傅恒志[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《金属学报》2005年第3期260-266,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目50271020和50395102

摘　　要：利用TiAl二元系的热力学模型,计算了Ti-(44-50)Al(原子分数, ％)合金包晶反应附近的相图,确定了初生相 β和包晶相α的固、液相线,得到了界面响应函数所需的部分参数.利用这些参数及单相合金凝固界面响应函数模型,计算了初 生相β和包晶相α的界面温度与生长条件变化的关系;结合最高界面生长温度判据.分析了Ti-(44-50)Al合金凝固过程中的 相选择和组织演化,并确定了Ti-Al合金稳态凝固时以成分和G/v为框架的相选择图.Using the thermodynamic model of TiAl binary system, part of phase diagram of Ti(44-50)Al around the peritectic reaction was calculated and the solidus and liquidus of primary phase beta and peritectic phase alpha were determined and the parameters used for interface response function were obtained. The interface temperatures of primary phase beta and peritectic phase alpha were calculated for different growth conditions. According to the criterion of the maximum growth temperature, the phase selection and microstructure evolution of Ti-(44-50)AI were theoretically studied and a microstructure-selection map of TiAl stable state solidification as a function of the melt composition and the G/v ratio was constructed.

关 键 词：Ti—Al合金 包晶凝固 界面响应函数 组织选择 

分 类 号：TG132.32[一般工业技术—材料科学与工程]