张颖异,李运刚,师学峰,齐渊洪,邹宗树

• 1:钢铁研究总院先进钢铁流程及材料国家重点实验室
• 2:东北大学材料与冶金学院
• 3:河北联合大学冶金与能源学院

摘要(Abstract)：

采用渗硅工艺制备了Mo-MoSi2功能梯度材料,并利用扫描电镜、X射线衍射以及弯曲强度试验观察并分析Mo-MoSi2功能梯度材料的微观结构和断裂行为。结果表明,梯度材料由表及里的结构变化形式为表层MoSi2晶粒(尺寸为6.8μm)+少量Si→MoSi2柱状晶粒(长度为15μm)→过渡层(2μm)→Mo基体。该Mo-MoSi2功能梯度材料具有组织致密,MoSi2晶粒细小,梯度层与Mo基体界面结合良好等特点。Mo-MoSi2梯度材料具有良好的弯曲性能,弯曲强度为1025 MPa,断裂挠度为1.87 mm,弹性模量为26.6 GPa。在保证Mo基体强度的同时,MoSi2功能梯度涂层显著提高了Mo基体塑性性能。Mo-MoSi2梯度材料的弯曲断裂形式主要为沿晶断裂和穿晶断裂两种形式。过渡层和MoSi2涂层形成是Mo-MoSi2功能梯度材料断裂韧性提高的主要原因。

关键词(KeyWords)： 渗硅;Mo-MoSi2;功能梯度材料;微观结构;弯曲强度

Abstract:

Keywords:

基金项目(Foundation): 河北省自然科学基金(E2010000945);; 国家自然科学基金(50474079)

作者(Author): 张颖异,李运刚,师学峰,齐渊洪,邹宗树

DOI: 10.13289/j.issn.1009-6264.2014.10.001

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