利用真空非自耗电弧炉制备了较大成分范围的Nb-Ti-C合金,研究Ti、C含量变化对Nb-Ti-C合金组织结构和组成相点阵常数的影响.研究表明:合金凝固组织由Nbss和(Nb,Ti)C构成,且Nb-9Ti-8C和Nb-14Ti-12C合金存在Nb2C相,Nbss与(Nb,Ti)C两相具有洁净的界面.Nbss在C含量较低(4 at％)的合金中作为初生相析出,在C含量较高(8 at％ ～16 at％)的合金中做为二次结晶相析出,初生和次生的Nbss均呈枝晶或树枝晶生长,且在C含量一定时其枝晶尺寸随Ti含量的增加而增大.XRD和透射分析表明(Nb,Ti)C处于明显的C缺乏状态,C原子缺失引起fcc(Nb,Ti)C主衍射斑点之间出现衍射强度较弱的条状新斑点.Nb-21Ti-4C合金(Nb,Ti)C中C原子与金属原子的实际比值为0.65,并且(Nb,Ti)C中C原子缺失程度随Ti含量增加而增大.
参考文献
| [1] | Heilmaier M,Krüger M,Saage H,et al .Metallic materials for structural applications beyond nickel-based superalloys[J].Jom,2009,61(7):61-67.,2009. |
| [2] | Sha J,Hirai H,Ueno H,et al .Mechanical properties of as-cast and directionally solidified Nb-Mo-W-Ti-Si in-situ composites at high temperatures[J].Metallurgical and Materials Transactions A,2003,34(1):85-94.,2003. |
| [3] | Zelenitsas K,Tsakiropoulos P .Effect of Al,Cr and Ta additions on the oxidation behaviour of Nb-Ti-Si in situ composites at 800 ℃[J].Mater Sci Eng A,2006,416:269-280.,2006. |
| [4] | Bewlay B P,Jackson M R,Lipsitt H A .The balance of mechanical and environmental properties of a multielement niobium-niobium silicide-based in situ composite[J].Metallurgical and Materials Transactions A,1996,27(12):3801-3808.,1996. |
| [5] | Schlesinger M E,Okamoto H,Gokhale A B,et al .The Nb-Si (niobium-silicon) system[J].Journal of Phase Equilibria,1993,14(4):502-509.,1993. |
| [6] | Leonard K J,Mishurda J C,Vasudevan V K,et al .Examination of solidification pathways and the liquidus surface in the Nb-Ti-Al System[J].Metall Mater Trans B,2000,31(6):1305-1320.,2000. |
| [7] | Julieta Ventura,Benedict Portillo,Varma S K,et al .Oxidation resistant NbCr2 phase in Nb-W-Cr system[J].Journal of Alloys and Compounds,2009,476:257-262.,2009. |
| [8] | Ding R G,Jones I P,Jiao H S .Effect of Mo and Hf on the mechanical properties and microstructure of Nb-Ti-C alloys[J].Mater Sci Eng A,2007,458:126-135.,2007. |
| [9] | Ding R G,Jones I P,et al .Influence of carbides on the strength and toughness of a niobium alloy[J].Mater Sci Technol,2010,26(3):323-332.,2010. |
| [10] | Jiao H S,Jones I P,Aindow M .Microstructure and mechanical properties of Nb-Ti-C alloys[J].Mater Sci Eng A,2008,484:359-366.,2008. |
| [11] | Ranganath S .A review on particulate-reinforced titanium matrix composites[J].Journal of Materials Science,1997,32(1):1-16.,1997. |
| [12] | WEI Wen-qing,WANG Hong-wei,ZOU Chun-ming,et al .Microstructure and oxidation behavior of Nb-based multi-phase alloys[J].Materials and Design,2013,46(4):1-7.,2013. |
| [13] | Ono K,Moriyama J .The phase relationships in the Nb-Ti-C system[J].Journal of the Less Common Metals,1981,79(2):255-260.,1981. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%