通过控制激光功率使Nb-12Ti-22Al(at%)和Nb-22Al(at%)两种成分配比的混合元素粉末在Ti-6Al-4V基体上激光沉积合成了Nb3Al基难熔金属间化合物,并达到了预期设定的成分配比,其显微组织均匀细小,在δ-Nb3Al基体上分布着不同形态的β-Nbss.在合适的激光功率下,无裂纹的沉积层厚度有一定的限制,随着沉积厚度的增加,沉积层中残余拉应力增大,沉积薄壁件容易在底部发生断裂.由于Ti的添加使Nb-12Ti-22Al的的裂纹倾向性小于Nb-22Al.
参考文献
| [1] | PHIPPS Claude.Laser applications overview:The state of the art and the future trend in the United States[A].Osaka,Japan,2003:1-10. |
| [2] | WEIPING LIU;J. N. DUPONT .In-Situ Reactive Processing of Nickel Aluminides by Laser-Engineered Net Shaping[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2003(11):2633-2641. |
| [3] | 曲士昱 .Nb/Nb_5Si_3复合材料基础研究[D].北京航空材料研究院,2002. |
| [4] | SIRCAR S;CHATTOPADHYAY K;MAZUMDER J .Nonequilibrium synthesis of NbAl3 and Nb-Al-V alloys by laser cladding.Part I.Microstructure evolution[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1992,23(09):2419-2429. |
| [5] | SCHULZE K;RICKES B;PETZOW G .Reactions of Nb-Al powder mixtures during sintering[J].Journal of the Less-Common Metals,1984,100:429-441. |
| [6] | Peng Z.;Froes F.H. .Mechanical Alloying of Nb-Al Powders[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1996(1):41-48. |
| [7] | JORDA J L;FLüKIGER R F;MULLER J .New Metallurgical Investigation of the Niobium-Aluminium System[J].Journal of THE LESS-COMMON METALS,1980,75:227-239. |
| [8] | Dong-Seok Chung;Manabu Enoki;Teruo Kishi .Microstructural analysis and mechanical properties of in situ Nb/Nb-aluminide layered materials[J].Science and technology of advanced materials,2002(2):129-135. |
| [9] | Froes FH.;Russell K.;Li CG.;Suryanarayana C. .SYNTHESIS OF INTERMETALLICS BY MECHANICAL ALLOYING[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(0):612-623. |
| [10] | Philip Nash;Ole Kleppa .Composition dependence of the enthalpies of formation of NiAl[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2001(2):228-231. |
| [11] | Keith J. Leonard;Vijay K. Vasudevan .Phase equilibria and solid state transformations in Nb-rich Nb-Ti-Al intermetallic alloys[J].Intermetallics,2000(9/11):1257-1268. |
| [12] | T. Tabaru S. Hanada .Microstructure control and compressive strength of 10 mol% Ti-bearing Nb3Al/Nbss in-situ composites[J].Intermetallics,1999(7):807-819. |
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%