Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy

1996 ◽  
Vol 27 (10) ◽  
pp. 3066-3073 ◽  
Author(s):  
Kurt Jacobus ◽  
Huseyin Sehitoglu ◽  
Mark Balzer
Keyword(s):  
Stress State ◽  
Martensitic Transformation ◽  
Ti Alloy

Martensitic transformation and giant magneto-functional properties in all-d-metal Ni-Co-Mn-Ti alloy ribbons

2019 ◽  
Vol 790 ◽  
pp. 78-92 ◽  
Author(s):  
Kai Liu ◽  
Shengcan Ma ◽  
Chicheng Ma ◽  
Xingqi Han ◽  
Kun Yu ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Functional Properties ◽  
Ti Alloy

scholarly journals Some Observations of Ausageing Effects on the Martensitic Transformation in an Fe–Ni–Ti Alloy

1984 ◽  
Vol 25 (2) ◽  
pp. 80-88 ◽  
Author(s):  
Tsugio Tadaki ◽  
Kyoichiro Asayama ◽  
Ken’ichi Shimizu
Keyword(s):  
Martensitic Transformation ◽  
Ti Alloy

scholarly journals Influence of heat treatment and stress state on the functional and mechanical properties of the [001]-oriented single crystals of fenicoalti alloy

2020 ◽  
pp. 132-140
Author(s):  
I.V. Kuksgauzen ◽  
◽  
Y.I. Chumlyakov ◽  
I.V. Kireeva ◽  
V.V. Poklonov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stress State ◽  
Martensitic Transformation ◽  
Single Crystals ◽  
Maximum Increase ◽  
Β Phase ◽  
Tension And Compression ◽  
Aging Regime ◽  
The Difference

The effect of the γ'- and β-phase particles on the thermoelastic γ-α' martensitic transformation (MT) during cooling/heating and under stress was studied under tension and compression on the [001]-oriented single crystals of Fe-28%Ni-17%Co-11.5%Al-2.5%Ti (at.%) alloy. The effect of the aging regime on the Ms temperature was shown. Maximum increase in the Ms temperature by 100 K was found with the simultaneous precipitation of the γ'- and β-phase particles after two-stage aging of 4+4h at 873 K, in comparison with single-stage aging for 8h. In crystals with γ' and γ'+β-phases particles the difference (asymmetry) of the stresses for the stress-induced γ-α' MT σcr and value α = d σcr/ dT under tension and compression were not observed. The absence of asymmetry of the σ cr and value α = d σcr/ dT are due to close values of the shape memory effect (SME) and superelasticity (SE) under tension and compression. The values of SME and SE were decreased when β-phase particles are precipitated.

Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review

2020 ◽  
Vol 1000 ◽  
pp. 428-435
Author(s):  
Eung Ryul Baek ◽  
Ghozali Suprobo
Keyword(s):  
Mechanical Property ◽  
Titanium Alloy ◽  
Phase Transformation ◽  
Martensitic Transformation ◽  
Massive Transformation ◽  
Ti Alloy ◽  
Α Phase ◽  
Massive Phase ◽  
Microstructural Design ◽  
And Diffusion

Microstructural design is generally applied to improve the mechanical property of titanium alloy by introducing different phase transformations and thermomechanical treatments. Aside from the martensitic and diffusion transformation, the occurrence of massive transformation occurs in Ti alloy. Massive transformation is categorized as civilian phase transformation, which resulted in the change of crystal structure of an alloy with a given composition without changing the chemical composition of its initial phase. It happened when the body centered-cubic β phase changed into hexagonal closed-pack α phase without decomposing into α+β. Massive transformation involves a diffusion and growth mechanism in a short-range and generally occurs during the introduction of high cooling rates to restrict the full diffusion mechanism. Owing to the nature of a rapid cooling rate as a requirement for massive transformation, the massive phase is normally found together with the product of martensitic transformation. On the other hand, the product of massive transformation is observed as a blocky grain with a featureless characteristic using optical microscopy and. Phase identification using electron backscattered diffraction shows that the region of αm shows only the presence of the α phase. It was reported for containing a high dislocation density similar to martensitic transformation. Specifically, in Ti alloy, the higher magnification using scanning electron microscopy shows fine sub-lamellar morphology, which observed as a combination product morphology between martensitic and diffusion transformation. It resulted in the mechanical property of the massive phase is between those two morphologies. Hence, it brings a new perspective on designing the microstructure of Ti alloy, which can be used to improve the mechanical property of Ti alloy.

Grain reorientation and stress-state evolution during cyclic loading of an α-Ti alloy below the elastic limit

2021 ◽  
pp. 106614
Author(s):  
Rachel E. Lim ◽  
Darren C. Pagan ◽  
Joel V. Bernier ◽  
Paul A. Shade ◽  
Anthony D. Rollett
Keyword(s):  
Stress State ◽  
Cyclic Loading ◽  
Elastic Limit ◽  
Ti Alloy ◽  
State Evolution
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