Study on the relationship between microstructure and mechanical property in a metastable β titanium alloy

Li, C.; Chen, J.; Li, W.; He, Jiahong; Qiu, Wei; Ren, Yongmao; Chen, J.H.

doi:10.1016/j.jallcom.2014.12.100

Cited by 55 publications

(23 citation statements)

References 21 publications

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“…It was well documented that the final mechanical properties were strongly influenced by several characteristics of microstructure like grain size, phase morphology, residual stress, and so on [1,2]. In the severe plastic deformation (SPD) process, plastic deformation and strain-path resulted in significant and complex changes of microstructure and mechanical properties [3].…”

Section: Introductionmentioning

confidence: 99%

Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Zheng

Zhang

Xie

et al. 2019

Metals

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A newly proposed multi-directional forging (MDF) was successfully applied to a commercially pure titanium (CP Ti). Severe plastic deformation would result in significant and complex changes of microstructure and mechanical properties, so microstructure characterization and a mechanical test of CP Ti were conducted after different cycles of MDF. The results demonstrated that dynamic recrystallization was the dominant grain refinement mechanism of MDF CP Ti. With increasing the cycles of MDF, grain size, fraction of low angle grain boundaries and dislocations density decreased due to grain refined. After three cycles of MDF, the mean grain size was about 200 nm. The values of tensile strength and hardness increased significantly from zero cycles to one cycle of MDF, but increased slowly after one MDF cycle. Numerous dimples and tear ridges were present, but the dimples were smaller and shallower with increasing cycles of MDF.

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Section: Introductionmentioning

confidence: 99%

Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Zheng

Zhang

Xie

et al. 2019

Metals

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“…They are usually enhanced by precipitations of ω and α using aging treatment [4]. A number of work on microstructure evolution and age hardening on beta titanium alloys have been performed to evaluate the microstructure/property relationship, such as Ti-10V-2Fe-3Al [5][6][7], Ti-3Al-8V-6Cr-4Mo-4Zr (Beta-C) [8], Ti-11.5Mo-6Zr-4.5Sn (Beta III) [9][10][11], Ti-15V-3Cr-3Sn-3Al [12][13][14][15][16], Ti-6.8Mo-4.5Fe-1.5Al (Timetal LCB) [17][18][19][20], and more recently, Ti-5Al-5Mo-5V-3Cr (Ti-5553) [21][22][23][24][25][26]. Previous work suggests that the strength level of beta titanium alloy is generally controlled by the distribution, size and volume fraction of ω and/or α precipitates, depending on aging temperatures and time; while the ductility is determined by not only the grain size of prior β phase, but also the morphology and distribution of primary α phase [27,28].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and age hardening behavior of a new metastable beta Ti–2Al–9.2Mo–2Fe alloy

et al. 2015

Materials Science and Engineering: A

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“…However, the PFZ of α phase may be formed, irrespective of the existence of PFZ of the β ′ phase. The PFZ of α phase is considered to be formed because α stabilizer near a grain boundary decreases due to the formation of a grain-boundary α phase 19) . Therefore, even in a case where the β ′ phase precip- itates near a grain boundary (i.e., PFZ of the β ′ phase does not exist), the PFZ of α phase may be formed if α stabilizer decreases due to formation on the grain-boundary of α phase.…”

Section: Two-step Agingmentioning

confidence: 99%

Effects of α Phase Nucleating at Transition Phase and Dislocation on Mechanical Properties in Metastable β Titanium Alloy Ti-6.8Mo-4.5Fe-1.5Al

et al. 2017

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Effects of α phase nucleating at a transition phase and dislocation on mechanical properties in a metastable β titanium alloy, Ti-6.8Mo-4.5Fe-1.5Al(mass%), were investigated. Tensile test and optical, scanning, and transmission electron microscopy were used. Two-step aging promoted the precipitation of a ne α phase in grain interiors because the α phase nucleated at a transition phase of β ′ . A precipitation-free zone appeared at rst, but nally disappeared during aging. A specimen that included the precipitation-free zone showed lower yield strength and larger elongation than it did without the precipitation-free zone. This was because dislocation could easily glide in the precipitation-free zone, which was veri ed from examination of the intergranular ductile fracture surface. The transition phase of β ′ promoted the disappearance of a precipitation-free zone, due to the promotion of α phase precipitation, resulting in enhancement of yield strength and deterioration of elongation. It is likely that the width of PFZ and the crystallographic orientation of β grains determine fracture mode to be intergranular ductile, intergranular brittle or intragranular fractures. Aging after tensile deformation produced α phase precipitation at dislocation. A speci c variant of α phase was selected due to a stress eld around the dislocation that included a planar slip band. This resulted in the formation of a large colony of the speci c α variant, while elongation deteriorated because the large colony probably facilitated crack propagation.

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Study on the relationship between microstructure and mechanical property in a metastable β titanium alloy

Cited by 55 publications

References 21 publications

Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Microstructural evolution and age hardening behavior of a new metastable beta Ti–2Al–9.2Mo–2Fe alloy

Effects of α Phase Nucleating at Transition Phase and Dislocation on Mechanical Properties in Metastable β Titanium Alloy Ti-6.8Mo-4.5Fe-1.5Al

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