6th International Conference on Nanomaterials by Severe Plastic Deformation | |
Influence of UFG structure formation on mechanical and fatigue properties in Ti-6Al-7Nb alloy | |
材料科学;化学 | |
Polyakova, V.V.^1 ; Anumalasetty, V.N.^2 ; Semenova, I.P.^1 ; Valiev, R.Z.^1,3 | |
Ufa State Aviation Technical University, K. Marx Street 12, 450 000, Ufa, Russia^1 | |
Carpenter Technology Corporation, RandD Bldg.68, POBox: 14662, Reading, PA, 19612-4662, United States^2 | |
Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, Universitetsky pr. 28, Peterhof, 198504, Saint Petersburg, Russia^3 | |
关键词: Coarse grained alloys; Cyclic fatigue tests; Fatigue endurance limit; Fatigue properties; Fatigue striations; Thermo-mechanical processing; UFG microstructure; Ultrafine-grained Ti; | |
Others : https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012162/pdf DOI : 10.1088/1757-899X/63/1/012162 |
|
学科分类:材料科学(综合) | |
来源: IOP | |
【 摘 要 】
Ultrafine-grained (UFG) Ti alloys have potential applications in osteosynthesis and orthopedics due to high bio-compatibility and increased weight-to- strength ratio. In current study, Ti6Al7Nb ELI alloy is processed through equal channel angular pressing-conform (ECAP-Conform) and subsequent thermomechanical processing to generate a UFG microstructure. The fatigue properties of UFG alloys are compared to coarse grained (CG) alloys. Our study demonstrates that the UFG alloys with an average grain size of ∼180 nm showed 35% enhancement of fatigue endurance limit as compared to coarse-grained alloys. On the fracture surfaces of the UFG and CG samples fatigue striations and dimpled relief were observed. However, the fracture surface of the UFG sample looks smoother; fewer amounts of secondary micro-cracks and more ductile rupture were also observed, which testifies to the good crack resistance in the UFG alloy after high-cyclic fatigue tests.
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
Influence of UFG structure formation on mechanical and fatigue properties in Ti-6Al-7Nb alloy | 7586KB | download |