Ultrahigh strain hardening in a transformation-induced plasticity and twinning-induced plasticity titanium alloy

Fu, Yu; Xiao, Wenlong; Kent, Damon; Dargusch, Matthew S.; Wang, Junshuai; Zhao, Xinqing; Ma, Chaoli

doi:10.1016/j.scriptamat.2020.06.029

Cited by 89 publications

(35 citation statements)

References 30 publications

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“…to retain 100% β-phase with body-centered cubic (BCC) structure even after quenching alloys from β singlephase region to ambient temperature [1]. Metastable β-phase enables stress-induced martensitic transformation (MT) and sometimes deformation twining, which leads to super-elasticity, transformation-induced plasticity (TRIP) and twining-induced plasticity (TWIP) [2][3][4]. Such a variety of deformation characteristics has attracted intensive attention to β-Ti alloys.…”

Section: Introductionmentioning

confidence: 99%

Achieving large super-elasticity through changing relative easiness of deformation modes in Ti-Nb-Mo alloy by ultra-grain refinement

Zhang

Huang

Mao

et al. 2021

Materials Research Letters

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Large super-elasticity approaching its theoretically expected value was achieved in Ti-13.3Nb-4.6Mo alloy having an ultrafine-grained β-phase. In-situ synchrotron radiation X-ray diffraction analysis revealed that the dominant yielding mechanism changed from dislocation slip to martensitic transformation by decreasing the β-grain size down to sub-micrometer. Different grain size dependence of the critical stress to initiate dislocation slip and martensitic transformation, which was reflected by the transition of yielding behavior, was considered to be the main reason for the large super-elasticity in the ultrafine-grained specimen. IMPACT STATEMENT The present study clarified that ultra-grain refinement down to sub-mirometer scale made dislocation slips more difficult than martensitic transformation, leading to an excellent super-elasticity close to the theoretical limit in the β-Ti alloy.

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Section: Introductionmentioning

confidence: 99%

Achieving large super-elasticity through changing relative easiness of deformation modes in Ti-Nb-Mo alloy by ultra-grain refinement

Zhang

Huang

Mao

et al. 2021

Materials Research Letters

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“…The law of phase mixture states that the higher the weight fraction of a phase, the higher the influence of this phase on the alloy’s overall mechanical behavior [ 78 , 79 ]. Additionally, one must consider how the influence of the size of crystalline grains on mechanical properties, per the Hall–Petch correlation [ 80 , 81 , 82 ], and the strain-hardening phenomena, occurring due to the increased density of defects at crystalline level, lead to an increase in the strength properties and a decrease in the ductility [ 83 , 84 , 85 ].…”

Section: Resultsmentioning

confidence: 99%

“…The observed crystallite size evolution shows the grain refinement is present and leads to a reduction in size with the progress of the applied degree of deformation, and, as a consequence of the Hall–Petch correlation, to increased strength properties. Additionally, signs of induced strain hardening are visible, leading to an increase in the necessary stress needed to accommodate the applied strain and, therefore, to an increase in the strength properties and a decrease in ductility [ 83 , 84 , 85 ].…”

Section: Resultsmentioning

confidence: 99%

Evolution of Microstructural and Mechanical Properties during Cold-Rolling Deformation of a Biocompatible Ti-Nb-Zr-Ta Alloy

et al. 2022

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In this study, a Ti-32.9Nb-4.2Zr-7.5Ta (wt%) titanium alloy was produced by melting in a cold crucible induction in a levitation furnace, and then deforming by cold rolling, with progressive deformation degrees (thickness reduction), from 15% to 60%, in 15% increments. The microstructural characteristics of the specimens in as-received and cold-rolled conditions were determined by XRD and SEM microscopy, while the mechanical characteristics were obtained by tensile and microhardness testing. It was concluded that, in all cases, the Ti-32.9Nb-4.2Zr-7.5Ta (wt%) showed a bimodal microstructure consisting of Ti-β and Ti-α″ phases. Cold deformation induced significant changes in the microstructural and the mechanical properties, leading to grain-refinement, crystalline cell distortions and variations in the weight-fraction ratio of both Ti-β and Ti-α″ phases, as the applied degree of deformation increased from 15% to 60%. Changes in the mechanical properties were also observed: the strength properties (ultimate tensile strength, yield strength and microhardness) increased, while the ductility properties (fracture strain and elastic modulus) decreased, as a result of variations in the weight-fraction ratio, the crystallite size and the strain hardening induced by the progressive cold deformation in the Ti-β and Ti-α″ phases.

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“…In Ti and its alloys, the most commonly observed tension twins are

and

, and the compression twins are

and

[ 11 , 12 , 13 , 14 ]. Twinning-induced plasticity (TWIP) has been put forward to interpret the abnormal high ductility of Ti at low temperature because of the rich twinning system in Ti [ 15 ]. In Zr and its alloys,

tension twin is more popularly observed than

twin [ 16 ], whereas

twin is dominant during c-axis compression.…”

Section: Introductionmentioning

confidence: 99%

The Plastic Deformation Mechanisms of hcp Single Crystals with Different Orientations: Molecular Dynamics Simulations

Tang

Mao

et al. 2021

Materials

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The deformation mechanisms of Mg, Zr, and Ti single crystals with different orientations are systematically studied by using molecular dynamics simulations. The affecting factors for the plasticity of hexagonal close-packed (hcp) metals are investigated. The results show that the basal <a> dislocation, prismatic <a> dislocation, and pyramidal <c + a> dislocation are activated in Mg, Zr, and Ti single crystals. The prior slip system is determined by the combined effect of the Schmid factor and the critical resolved shear stresses (CRSS). Twinning plays a crucial role during plastic deformation since basal and prismatic slips are limited. The 101¯2 twinning is popularly observed in Mg, Zr, and Ti due to its low CRSS. The 101¯1 twin appears in Mg and Ti, but not in Zr because of the high CRSS. The stress-induced hcp-fcc phase transformation occurs in Ti, which is achieved by successive glide of Shockley partial dislocations on basal planes. More types of plastic deformation mechanisms (including the cross-slip, double twins, and hcp-fcc phase transformation) are activated in Ti than in Mg and Zr. Multiple deformation mechanisms coordinate with each other, resulting in the higher strength and good ductility of Ti. The simulation results agree well with the related experimental observation.

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Ultrahigh strain hardening in a transformation-induced plasticity and twinning-induced plasticity titanium alloy

Cited by 89 publications

References 30 publications

Achieving large super-elasticity through changing relative easiness of deformation modes in Ti-Nb-Mo alloy by ultra-grain refinement

Achieving large super-elasticity through changing relative easiness of deformation modes in Ti-Nb-Mo alloy by ultra-grain refinement

Evolution of Microstructural and Mechanical Properties during Cold-Rolling Deformation of a Biocompatible Ti-Nb-Zr-Ta Alloy

The Plastic Deformation Mechanisms of hcp Single Crystals with Different Orientations: Molecular Dynamics Simulations

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