Deformation Structure and Mechanical Properties of Pure Titanium Produced by Rotary-Die Equal-Channel Angular Pressing

Gu, Yuanzheng; Ma, Aibin; Jiang, Jinghua; Yuan, Yong; Li, Huiyun

doi:10.3390/met7080297

Cited by 14 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has a good level of microstructural homogeneity also confirmed by Figure 9 but it has not an ideal homogenous structure, the existence of some parallel shear bands, indistinguishable cell boundaries and high dislocation density regions which is apparent from color differences in the interior section of grains are some slight traces of microstructural heterogeneity. The occurrence of mixture structural phenomena including shear bands, elongated and equiaxed grains and substructures in four-passed ECAE Ti and SPDed Ti also was shown in previous studies [12,45,46]. It was shown that annealing in the temperature range of 400-450°C for half an hour could lead to microstructural homogeneity [34].…”

Section: Annealedsupporting

confidence: 66%

Microhardness evolution of pure titanium deformed by equal channel angular extrusion

Attarilar

Salehi

Djavanroodi

2019

Metall. Res. Technol.

View full text Add to dashboard Cite

Microhardness homogeneity was assessed on commercial pure titanium processed by equal channel angular extrusion (ECAE). The operation was performed with die channel angle of 90° and processing temperature of 450 °C by route BC up to six passes. The Vickers microhardness measurements were investigated on both cross-sectional and longitudinal planes of the annealed, one-, two-, four-, and six-pass ECAEed titanium. It was found that the application of the process and the addition of pass numbers lead to the improvement of hardness magnitude. It was shown that there are some areas of microhardness heterogeneity in surrounding and bottom regions of the one-pass and two-pass specimens at the cross-sectional plane which is slightly disappeared by adding the pass numbers. Furthermore, there is a suitable amount of hardness homogeneity in the longitudinal plane, irrespective of the specimen condition. It can be concluded that a desirable homogeneity of hardness can be attained after imposing six passes of ECAE process on both cross-sectional and longitudinal planes of titanium.

show abstract

Section: Annealedsupporting

confidence: 66%

Microhardness evolution of pure titanium deformed by equal channel angular extrusion

Attarilar

Salehi

Djavanroodi

2019

Metall. Res. Technol.

View full text Add to dashboard Cite

show abstract

“…This level of consideration is missing in model [ 12 ] and, more generally, in the models based on the homogenization approach, and will present a challenge for future investigations. It is particularly interesting in view of the recent technological developments which show a tendency to fabricate Ti and Ti alloys with complex microstructures containing micro- and nano-size elements, e.g., submicron grains [ 34 , 35 , 36 ].…”

Section: Discussionmentioning

confidence: 99%

Complexity and Anisotropy of Plastic Flow of α-Ti Probed by Acoustic Emission and Local Extensometry

et al. 2018

View full text Add to dashboard Cite

Current progress in the prediction of mechanical behavior of solids requires understanding of spatiotemporal complexity of plastic flow caused by self-organization of crystal defects. It may be particularly important in hexagonal materials because of their strong anisotropy and combination of different mechanisms of plasticity, such as dislocation glide and twinning. These materials often display complex behavior even on the macroscopic scale of deformation curves, e.g., a peculiar three-stage elastoplastic transition, the origin of which is a matter of debates. The present work is devoted to a multiscale study of plastic flow in α-Ti, based on simultaneous recording of deformation curves, 1D local strain field, and acoustic emission (AE). It is found that the average AE activity also reveals three-stage behavior, but in a qualitatively different way depending on the crystallographic orientation of the sample axis. On the finer scale, the statistical analysis of AE events and local strain rates testifies to an avalanche-like character of dislocation processes, reflected in power-law probability distribution functions. The results are discussed from the viewpoint of collective dislocation dynamics and are confronted to predictions of a recent micromechanical model of Ti strain hardening.

show abstract

“…On the other hand, Zhao et al [22] revealed that the microstructure of titanium processed by one-pass of ECAP at RT is characterised by a high density of {10 12} twinning. After the first pass of ECAP, Chen et al [147] observed both {10 11} and {10 12} twins in the microstructure of CP titanium processed at 450 • C. Gu et al [148] ECAPed titanium at 420 • C and detected {10 12} twins after the first pass and {10 11} twins after the second pass. Moreover, they revealed that the dislocation slip is the main deformation mechanism when processing titanium with third and fourth passes of ECAP.…”

Section: Twinning Of Titanium Due To Ecapmentioning

confidence: 99%

Effects of processing conditions on microstructure and mechanical properties of equal-channel-angular-pressed titanium

Shaat

2018

Materials Science and Technology

View full text Add to dashboard Cite

This review presents an investigation on effects of the processing conditions on the microstructural evolution and mechanical properties of commercial pure titanium processed by Equal Channel Angular Pressing (ECAP). An overview of ECAP processing is presented. A discussion on the microstructure evolution of ECAPed titanium emphasising effects of the ECAP-route type, processing temperature, number of ECAP passes, and mechanical/thermal treatments is presented. Moreover, the variations of the mechanical properties (yield strength, tensile strength, and ductility) of titanium as functions of the grain size are reported for the different conditions of ECAP processing. In addition, the best estimates of the Hall–Petch parameters for titanium processed by ECAP, ECAP followed by mechanical and/or thermal annealing are reported.

show abstract

Deformation Structure and Mechanical Properties of Pure Titanium Produced by Rotary-Die Equal-Channel Angular Pressing

Cited by 14 publications

References 31 publications

Microhardness evolution of pure titanium deformed by equal channel angular extrusion

Microhardness evolution of pure titanium deformed by equal channel angular extrusion

Complexity and Anisotropy of Plastic Flow of α-Ti Probed by Acoustic Emission and Local Extensometry

Effects of processing conditions on microstructure and mechanical properties of equal-channel-angular-pressed titanium

Contact Info

Product

Resources

About