scholarly journals A new dynamic recrystallization mechanism in adiabatic shear band of an α/β dual phase titanium alloy: Composition redistribution

2022 ◽  
Vol 206 ◽  
pp. 114229
Author(s):  
Xinjie Zhu ◽  
Qunbo Fan ◽  
Duoduo Wang ◽  
Haichao Gong ◽  
Yu Gao ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Shear Band ◽  
Dynamic Recrystallization ◽  
Alloy Composition ◽  
Adiabatic Shear Band ◽  
Adiabatic Shear ◽  
Dual Phase ◽  
Recrystallization Mechanism

Mechanisms of Grains Refining in Adiabatic Shear Band of Titanium Alloy

2012 ◽  
Vol 562-564 ◽  
pp. 312-317
Author(s):  
Kun Sun ◽  
Yuan Xu ◽  
Jin Hao Liu
Keyword(s):  
Titanium Alloy ◽  
Electron Microscope ◽  
Shear Band ◽  
Dynamic Recrystallization ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
Optical Microscope ◽  
Adiabatic Shear

Dynamic shearing high strain-rate experiments on three types of titanium alloy have been carried out by using a modified split Hopkinson bar. Microstructure and mechanism for grains refining in adiabatic shear band formed under the condition of high strain-rate were investigated by means of optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). It is shown that the mechanisms for grains refining in adiabatic shear band of titanium alloy mostly consist of three sorts. They are the mechanism of breakdown of elongated grains which due to action of dislocations,and the mechanism of rupture of twins and the mechanism of dynamic recrystallization, respectively. The mechanism of dynamic recrystallization is the universal one for grains refining in adiabatic shear band of titanium alloy. The formation of refining grains is usually a result of combined action of several sorts of mechanisms.

The Study of Large Deformation Upsetting for TC16 Titanium Alloy

2014 ◽  
Vol 1004-1005 ◽  
pp. 1331-1335
Author(s):  
Bao Tong Zhuang ◽  
Feng Lei Liu ◽  
Hong Huang
Keyword(s):  
Titanium Alloy ◽  
Shear Band ◽  
Large Deformation ◽  
Adiabatic Shear Band ◽  
Optical Microscope ◽  
Adiabatic Shear ◽  
Grain Structure ◽  
Microstructure Transformation ◽  
The Matrix

The microstructure transformation in large deformation upsetting process of TC16 is studied by means of optical microscope and microhardness measuring. The results show that the rolled and annealed TC16 titanium alloy presents tiny isometric crystal grain structure of α+β. When the deformation of the plate nut head is up to 94%, the upsetted shank is overexpansion and the edge of the head laps. The specimen is scrapped due to the widmannstatten structure at the upsetting temperature of 900°C. An adiabatic shear band, the hardness of which is higher than the matrix and surrounding, is observed and widens as the heated temperature rises. Both the size and microstructure of the specimen meet the requirements at the upsetting temperature of 850°C.

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