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.

scholarly journals Adiabatic shear band localization in an Al–Zn–Mg–Cu alloy under high strain rate compression

2020 ◽  
Vol 9 (3) ◽  
pp. 3977-3983 ◽  
Author(s):  
Muhammad Abubaker Khan ◽  
Yangwei Wang ◽  
Ghulam Yasin ◽  
Faisal Nazeer ◽  
Abdul Malik ◽  
...  
Keyword(s):  
Shear Band ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
Adiabatic Shear ◽  
Cu Alloy ◽  
Strain Rate Compression ◽  
Shear Band Localization

Understanding of adiabatic shear band evolution during high-strain-rate deformation in high-strength armor steel

2020 ◽  
Vol 845 ◽  
pp. 155540 ◽  
Author(s):  
Min Cheol Jo ◽  
Selim Kim ◽  
Dae Woong Kim ◽  
Hyung Keun Park ◽  
Sung Suk Hong ◽  
...  
Keyword(s):  
Shear Band ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
High Strength ◽  
Adiabatic Shear ◽  
High Strain Rate Deformation ◽  
Armor Steel

Effects of Impressed-Current on Sensitivity of Adiabatic Shear of TC6 Titanium Alloy

2013 ◽  
Vol 718-720 ◽  
pp. 107-111
Author(s):  
Kun Sun ◽  
Kai Hua Yue ◽  
Yuan Xu ◽  
Wen Li Xiang ◽  
Wei Zhong
Keyword(s):  
Titanium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
Room Temperature ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
Dynamic Compression ◽  
Adiabatic Shear ◽  
Split Hopkinson ◽  
Impressed Current

Dynamic compression test on TC6 titanium alloy samples have been done by using a split Hopkinson bar process and extra circuit under conditions of room temperature and high strain-rate. The effect of impressed-current on sensitivity of adiabatic shear of TC6 titanium alloy has been studied. It is shown that the impressed-current can reduce the sensitivity of adiabatic shear of TC6 titanium alloy under the condition of high strain-rate. Free electron in the samples will do direct move and take heat away from high localized area to decrease the effect of the heat. The result will help to delay formation of the adiabatic shear band. So, that is reducing the sensitivity of adiabatic shear of TC6 titanium alloy.

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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