TiaAl-Nb-Mo composites were prepared by SHS using initial powder mixtures of Ti-Al-Nb-Mo and their corrosion and mechanical properties were studied to develop bio-and environmental materials. The composites reached 99.8% of theoretical densityafter the direct consolidation. The composites shows equiaxed primary α2 in a matrixof fine secondary α2 plates and ordered B2 (B0) forming a basket weave structure.The strain rate sensitivity (m = dlnσr/dlne) at 2% strain is 0.008. Corrosion po-tential and corrosion rate of the composites formed by SHS were -151.5mVSHE and5.72× 10-8A/cm2 for Ti3Al-10Nb-1.5Mo and -138.4m VSHE and 4.12×10-8cm-2 forTi3Al-12Nb-1.5Mo in a 50% NaOH-10%FeCl3 solution, respectively. Corrosion resis-tance decreased with niobium content in the composites and chloride content in theaqueous solution. Selective corrosion of α2 phase in a matrix occurred in the corrosionenvironment which suggests that the corrosion potential and rate changes are relatedto the niobium content and α2 phase in a matrix.
参考文献
| [1] | H A Lipsitt;D Schechtman;R E Schafrik .[J].Metallurgical and Materials Transactions,1980,11A:1369. |
| [2] | D A Lukasak;D A Koss .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1990,21A:135. |
| [3] | R E Schafrik .[J].Metallurgical and Materials Transactions,1977,8A:1003. |
| [4] | S M L Sastry;H A Lipsitt .[J].Metallurgical and Materials Transactions,1977,8A:1543. |
| [5] | G T Gray;S I Hong;B J Marquandt .[J].Metals and Materials,1996,2(02):31. |
| [6] | HWSizek;G T Gray .[J].冶金材料学报,1993(41):1855. |
| [7] | G T Gray;S I Hong;B J Marquardt .[J].Metals and Materials,1996,2(02):31. |
| [8] | P S Follansbee;G T Gray Ⅲ .[J].Metallurgical and Materials Transactions,1989,20A:863. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%