利用场发射扫描电镜(FE-SEM),X射线衍射仪(XRD),差热分析仪(DSC)等测试手段和分析方法,比较系统地研究了TB8钛合金的双级时效过程中组织演变及强化响应行为.结果表明:TB8钛合金在400℃/1 h预时效时β基体析出ω相,而在随后进行的500℃终级时效时ω相转变为α相.随着终级时效的持续,合金的硬度明显提高,合金析出α相的数量不断增加,尤其(101)α的衍射峰强度明显增强.经FE-SEM、DSC和XRD的结果分析发现,预时效处理产生了较多的细小弥散析出相,成为α沉淀相的转变基础,终级时效在5.5h时基本完成相转变,而双级时效有利于减小析出α相的尺寸.
参考文献
| [1] | Julien Da Costa Teixeira;Benoit Appolaire;Elisabeth Aeby-Gautier;Sabine Denis;Georges Cailletaud;Nadine Spaeth.Transformation kinetics and microstructures of Ti17 titanium alloy during continuous cooling[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20071/2(1/2):135-145. |
| [2] | Ming-Hui Cai;Chan-Young Lee;Young-Kook Lee.Effect of grain size on tensile properties of fine-grained metastable p titanium alloys fabricated by stress-induced martensite and its reverse transformations[J].Scripta materialia,20128(8):606-609. |
| [3] | Liqiang Wang;Weijie Lu;Jining Qin.Microstructure and mechanical properties of cold-rolled TiNbTaZr biomedical beta titanium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20081/2(1/2):421-426. |
| [4] | P. SCHMIDT;A. EL-CHAIKH;H.-J. CHRIST.Effect of Duplex Aging on the Initiation and Propagation of Fatigue Cracks in the Solute-rich Metastabie β Titanium Alloy Ti 38-644[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,20119(9):2652-2667. |
| [5] | S. Nag;R. Banerjee;R. Srinivasan.omega-Assisted nucleation and growth of alpha precipitates in the Ti-5Al-5Mo-5V-3Cr-0.5Fe beta titanium alloy[J].Acta materialia,20097(7):2136-2147. |
| [6] | J.I. Qazi;B. Marquardt;L.F Allard;H.J. Rack.Phase transformations in Ti-35Nb-7Zr-5Ta-(0.06-0.68)O alloys[J].Materials science & engineering, C. Biomimetic and supramolecular systems,20053(3):389-397. |
| [7] | Yasuya Ohmori;Toshitaka Ogo;Kiyomichi Nakai;Sengo Kobayashi.Effects of ω-phase precipitation on β→α,α" transformations in a metastable β titanium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20011/2(1/2):182-188. |
| [8] | Karthikeyan, T.;Dasgupta, A.;Khatirkar, R.;Saroja, S.;Samajdar, I.;Vijayalakshmi, M..Effect of cooling rate on transformation texture and variant selection during β→α transformation in Ti-5Ta-1.8Nb alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20102(2):549-558. |
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%