Phase transformation of iron under shock compression: Effects of voids and shear stress

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
Xinlin Cui ◽  
Wenjun Zhu ◽  
Hongliang He ◽  
Xiaoliang Deng ◽  
Yingjun Li
Keyword(s):  
Shear Stress ◽  
Phase Transformation ◽  
Shock Compression ◽  
Compression Effects

scholarly journals Phase transformation in boron under shock compression

2020 ◽  
Vol 108 ◽  
pp. 106376
Author(s):  
Shuai Zhang ◽  
Heather D. Whitley ◽  
Tadashi Ogitsu
Keyword(s):  
Phase Transformation ◽  
Shock Compression

Publisher's Note: Collective nature of plasticity in mediating phase transformation under shock compression [Phys. Rev. B89, 220101(R) (2014)]

2014 ◽  
Vol 90 (1) ◽  
Author(s):  
Hongxiang Zong ◽  
Xiangdong Ding ◽  
Turab Lookman ◽  
Ju Li ◽  
Jun Sun ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Shock Compression

EFFECT OF NANO-VOID ON THE PHASE TRANSFORMATION OF SINGLE CRYSTAL IRON UNDER SHOCK COMPRESSION

2008 ◽  
Author(s):  
X. L. Cui ◽  
W. J. Zhu ◽  
H. L. He ◽  
Y. J. Li ◽  
Mark Elert ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Single Crystal ◽  
Shock Compression

Shock Amorphization of Cristobalite

Science ◽  
1993 ◽  
Vol 259 (5095) ◽  
pp. 663-666 ◽  
Author(s):  
A. J. Gratz ◽  
L. D. DeLoach ◽  
T. M. Clough ◽  
W. J. Nellis
Keyword(s):  
Refractive Index ◽  
Phase Transformation ◽  
Silicon Dioxide ◽  
Shock Compression ◽  
Pressure Range ◽  
Shock Pressure ◽  
Shock Metamorphism ◽  
First Case

Shock amorphization of cristobalite is reported and related to shock metamorphism of quartz, both being silicon dioxide polymorphs. Whereas amorphization of quartz takes place over a broad pressure range and is complete only at 35 to 40 gigapascals (350 to 400 kilobars), amorphization of cristobalite was complete (greater than 99.9 percent) by 28 gigapascals with a relatively sharp phase transformation; lower shock pressures up to 23 gigapascals resulted in no significant amorphization. Also, unlike quartz, there was no sign of lamellar amorphization, which is common in shock compression. Cristobalite amorphization should prove a useful indicator of shock pressure and is the first case of pressure amorphization of isochemical polymorphs. The diaplectic glass that is produced has a refractive index and density essentially identical to those of the diaplectic glass made from quartz, which suggests that both polymorphs collapse during shock to similar disordered phases.

Molecular Dynamics Simulation of Nano-Sized Crystallization During Plastic Deformation in an Amorphous Metal

2000 ◽  
Vol 634 ◽  
Author(s):  
R. Tarumi ◽  
A. Ogura ◽  
M. Shimojo ◽  
K. Takashima ◽  
Y. Higo
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Shear Stress ◽  
Phase Transformation ◽  
Molecular Dynamics Simulation ◽  
Shear Strain ◽  
Orientation Relationship ◽  
Crystalline Structure ◽  
Amorphous Metal ◽  
Dynamics Simulation

ABSTRACTAn NTP ensemble molecular dynamics simulation was carried out to investigate the mechanism of nano-sized crystallization during plastic deformation in an amorphous metal. The atomic system used in this study was Ni single component. The total number of Ni atoms was 1372. The Morse type inter-atomic potential was employed. An amorphous model was prepared by a quenching process from the liquid state. Pure shear stresses were applied to the amorphous model at a temperature of 50 K. At applied stresses of less than 2.4GPa, a linear relation between shear stress and shear strain was observed. However, at an applied shear stress of 2.8 GPa, the amorphous model started to deform significantly until shear strain reached to 0.78. During this deformation process, phase transformation from amorphous into crystalline structure (fcc) was observed. Furthermore, an orientation relationship between shear directions and crystalline phase was obtained, that is, two shear directions are parallel to a (111) of the fcc structure. This crystallographic orientation relationship agreed well with our experimental result of Ni-P amorphous alloy. Mechanisms of phase transformation from amorphous into crystalline structure were discussed.

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