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6.8 μm)+少量Si→MoSi2柱状晶粒(长度为15 μm)→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.
参考文献
| [1] | Xu, JH;Leonhardt, T;Farrell, J;Effgen, M;Zhai, TG .Anomalous strain-rate effect on plasticity of a Mo-Re alloy at room temperature[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1/2):76-82. |
| [2] | Sufang Tang;Jingyi Deng;Shijun Wang;Wenchuan Liu;Ke Yang .Ablation behaviors of ultra-high temperature ceramic composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):1-7. |
| [3] | YAN Jianhui,XU Hongmei,ZHANG Houan,TANG Siwen.MoSi2 oxidation resistance coatings for Mo5Si3/MoSi2 composites[J].稀有金属（英文版）,2009(04):418-422. |
| [4] | 周宏明,易丹青,石章智.MoSi2基高温结构材料的研究进展[J].材料导报,2006(z2):404-408. |
| [5] | Kircher T A;Courtright E L .Engineering limitations of MoSi2 coatings[J].Materials Science and Engineering A,1992,155(1-2):67-74. |
| [6] | FENG Peizhong,QU Xuanhui,Akhtar Farid,S.H. Islam.Self-propagating high temperature synthesis of MoSi2 matrix composites[J].稀有金属（英文版）,2006(03):225-230. |
| [7] | 徐连勇,荆洪阳,霍立兴,张玉凤.金属基陶瓷涂层弹性模量和界面断裂韧度[J].焊接学报,2006(08):55-58. |
| [8] | 雷声,刘全坤,缪宪文,桂中祥,吴跃波,马灿.激光硬化层对GCr15钢弯曲性能的影响[J].材料热处理学报,2010(05):128-132. |
| [9] | Ashby M F.Strengthening Method in Crystals(edited by Kelly A and Nicholson R B)[M].Amsterdam:Elsevier,1971 |
| [10] | Faweett N .Novel method for the measurement of Young' s modulus for thick-film resistor material by flexural testing of coated beams[J].Measurement Science and Technology,1998,9(12):2023-2026. |
| [11] | Ma Q;Yang Y;Kang M et al.Microstructure and mechanical properties of hot-pressed MoSi2-matrix composites reinforced with SiC and ZrO2 particles[J].Composites Science and Technology,2001,61(07):963-969. |
| [12] | Lee JI.;Mah TI.;Hecht NL. .In situ processing and properties of SiC/MoSi2 nanocomposites[J].Journal of the American Ceramic Society,1998(2):421-424. |
| [13] | Zhibin Huang;Wancheng Zhou;Xiufeng Tang;Peng Li;Jiankun Zhu .Dielectric and Mechanical Properties of MoSi_2/Al_2O_3 Composites Prepared by Hot Pressing[J].Journal of the American Ceramic Society,2010(11):3569-3572. |
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