scholarly journals On the Effect of Volume Change and γ'-Precipitation Hardening on the Reversibility of Martensitic Transformation in Fe-Ni-Co-Ti-Alloy

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-475-C8-480
Author(s):  
G. Kubla ◽  
E. Hornbogen
Keyword(s):  
Martensitic Transformation ◽  
Volume Change ◽  
Precipitation Hardening ◽  
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

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.

Multi-stage martensitic transformation in Ni-rich NiTi shape memory alloys

2017 ◽  
Vol 10 (01) ◽  
pp. 1740004 ◽  
Author(s):  
Xiebin Wang ◽  
Bert Verlinden ◽  
Sergey Kustov
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Precipitation Hardening ◽  
Aging Treatment ◽  
Functional Stability ◽  
Transformation Behavior ◽  
Niti Alloys ◽  
Multi Stage ◽  
Niti Shape Memory Alloys

Precipitation hardening is an effective way to improve the functional stability of NiTi shape memory alloys. The precipitates, mainly Ni4Ti3, could be introduced by aging treatment in Ni-rich NiTi alloys. However, the presence of Ni4Ti3 precipitates could disturb the transformation behavior, resulting in the multi-stage martensitic transformation (MMT). With the presence of MMT, it is difficult to control the transformation behavior, and thus limits the applicability of NiTi alloys. In this work, previous efforts on explaining the observed MMT are summarized. The difficulties in developing a unified explanation are discussed, and a possible way to avoid the MMT is proposed.

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