用真空电弧熔炼方法制备了处于共晶区的Nb 18Si复合材料,用背散射电子相(BEI)和X射线衍射(XRD)分析了铸态和1 200℃×100h退火后复合材料的微观组织形貌和相组成,并进行了断口形貌分析.结果发现退火可以促进亚稳定相Nb3Si分解成Nb5Si3+Nb.延性相Nbss粒子尺寸和体积分数的增加影响材料的断口形貌,铸态的断口完全呈解理断裂,退火以后断口中出现界面脱离.脆性相对延性相的约束程度对材料的韧性影响很大.
参考文献
| [1] | Mendiratta M G;Dimiduk D M .Strength and toughness of a Nb/Nb5Si3 composite[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1993,24(02):501-504. |
| [2] | M.R.Jackson;B.P.Bewlay .High-Temperature Refractory Metal-Intermetallic Composites[J].JOM,1996(1):39-44. |
| [3] | SUBRAMANIAN P R;Mendiratta M G;Dimiduk D M.Advanced intermetallic alloys-beyond gamma titanium aluminides[J].Materials Science and Engineering,1997(12):1-13. |
| [4] | Mendiratta M G;Dimiduk D M .Phase relation and transformation kinetics on the high Nb region of the Nb-Si system[J].Scripta Metallurgica et Materialia,1991,25(01):237-242. |
| [5] | Kim W Y;Tanaka H;Kasama A et al.Microstructure and room temperature fracture toughness of Nb/Nb5Si3 in situ composites[J].Intermetallics,2001,9(09):827-834. |
| [6] | Ashby M F;Blunt F J;Bannister M .Flow characteristics of highly constrained metal wires[J].Acta Materialia,1989,37(07):1847-1857. |
| [7] | Won-Yong Kim;Hisao Tanaka;Shuji Hanada .Microstructure and high temperature strength at 1773K of Nb_(ss)/Nb_5Si_3 composites alloyed with molybdenum[J].Intermetallics,2002(6):625-634. |
| [8] | Mendiratta M G;Goetz R;Dimiduk D M .Unconstrained and constrained tensile flow and fracture behavior of an Nb-1.24at. pct Si alloy[J].Metallurgical and Materials Transactions,1995,26(07):1767-1776. |
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