D-7 Invited—Deformation Mechanisms in Amorphous and Nanocrystalline Metals Meaured by in Situ X-ray Diffraction

2009 ◽  
Vol 24 (2) ◽  
pp. 167-167
Author(s):  
R. T. Ott
Keyword(s):  
Deformation Mechanisms ◽  
Nanocrystalline Metals ◽  
X Ray Diffraction ◽  
X Ray

Crystal plasticity in shock-compressed hcp-iron

2021 ◽  
Author(s):  
Sébastien Merkel ◽  
Sovanndara Hok ◽  
Cynthia Bolme ◽  
Wendy Mao ◽  
Arianna Gleason
Keyword(s):  
Free Electron ◽  
Deformation Mechanisms ◽  
Free Electron Lasers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Close Packed ◽  
Planetary Cores ◽  
Materials Behavior ◽  
Optical Laser

<p>Iron is a key constituent of planetary core and an important technological material. Here, we combine <em>in situ</em> ultrafast X-ray diffraction at free electron lasers with optical-laser-induced shock compression experiments on polycrystalline Fe to study the plasticity of hexagonal close-packed (hcp)-Fe under extreme loading states. We identifiy the deformation mechanisms that controls the Fe microstructures and  observe a significant time-evolution of stress over the few nanoseconds of the experiments. These observations illustrate how ultrafast plasticity studies can reveal distinctive materials behavior under extreme loading states and will help constraining the pressure, temperature, and strain rate dependence of materials behavior in planetary cores.</p>

scholarly journals Footprints of deformation mechanisms during in situ x-ray diffraction: Nanocrystalline and ultrafine grained Ni

2005 ◽  
Vol 86 (23) ◽  
pp. 231910 ◽  
Author(s):  
Z. Budrovic ◽  
S. Van Petegem ◽  
P. M. Derlet ◽  
B. Schmitt ◽  
H. Van Swygenhoven ◽  
...  
Keyword(s):  
Deformation Mechanisms ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ultrafine Grained

scholarly journals In Situ Synchrotron X-ray Diffraction Investigations of the Nonlinear Deformation Behavior of a Low Modulus β-Type Ti36Nb5Zr Alloy

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1619
Author(s):  
Qingkun Meng ◽  
Huan Li ◽  
Kai Wang ◽  
Shun Guo ◽  
Fuxiang Wei ◽  
...  
Keyword(s):  
Elastic Deformation ◽  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
Deformation Mechanisms ◽  
X Ray Diffraction ◽  
Recoverable Strain ◽  
X Ray ◽  
Ti Alloys ◽  
Low Modulus

The low modulus β-type Ti alloys usually have peculiar deformation behaviors due to their low phase stability. However, the study of the underlying mechanisms is challenging since some physical mechanisms are fully reversible after the release of the load. In this paper, the deformation behavior of a low modulus β-type Ti36Nb5Zr alloy was investigated with the aid of in situ synchrotron X-ray diffraction (SXRD) during tensile loading. The evolution of lattice strains and relative integrated diffraction peak intensities of both the β and α” phases were analyzed to determine the characteristics of the potential deformation mechanisms. Upon loading, the α” diffraction spots appeared at specific azimuth angles of the two-dimensional SXRD patterns due to the <110> fiber texture of original β grains and the selection of favorable martensitic variants. The nonlinear deformation behavior originated from a reversible stress-induced martensitic transformation (SIMT). However, the SIMT contributed a little to the large recoverable strain of over 2.0%, which was dominated by the elastic deformation of the β phase. Various deformation mechanisms were activated successively at different applied strains, including elastic deformation, SIMT and plastic deformation. Our investigations provide in-depth understandings of the deformation mechanisms in β-type Ti alloys with low elastic modulus.

scholarly journals In situsynchrotron X-ray diffraction analysis of deformation behaviour in Ti–Ni-based thin films

2015 ◽  
Vol 22 (1) ◽  
pp. 34-41
Author(s):  
Hong Wang ◽  
Guangai Sun ◽  
Xiaolin Wang ◽  
Bo Chen ◽  
Xiaotao Zu ◽  
...  
Keyword(s):  
Thin Films ◽  
Deformation Behaviour ◽  
Deformation Mechanisms ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Expansion Coefficients ◽  
Post Annealing ◽  
Expansion Coefficients ◽  
Martensitic Variants

Deformation mechanisms of as-deposited and post-annealed Ti50.2Ni49.6, Ti50.3Ni46.2Cu3.5and Ti48.5Ni40.8Cu7.5thin films were investigated using thein situsynchrotron X-ray diffraction technique. Results showed that initial crystalline phases determined the deformation mechanisms of all the films during tensile loading. For the films dominated by monoclinic martensites (B19′), tensile stress induced the detwinning of 〈011〉 type-II twins and resulted in the preferred orientations of (002)B19′parallel to the loading direction (∥ LD) and (020)B19′perpendicular to the LD (⊥ LD). For the films dominated by austenite (B2), the austenite directly transformed into martensitic variants (B19′) with preferred orientations of (002)B19′ ∥ LD and (020)B19′ ⊥ LD. For the Ti50.3Ni46.2Cu3.5and Ti48.1Ni40.8Cu7.5films, martensitic transformation temperatures decreased apparently after post-annealing because of the large thermal stress generated in the films due to the large differences in thermal expansion coefficients between the film and substrate.

scholarly journals S59 In-Situ X-ray Diffraction Study of Nanocrystalline Metals

2008 ◽  
Vol 23 (2) ◽  
pp. 185-185
Author(s):  
S. Brandstetter ◽  
S. Van Petegem ◽  
J. Zimmermann ◽  
B. Schmitt ◽  
H. Van Swygenhoven
Keyword(s):  
Diffraction Study ◽  
Nanocrystalline Metals ◽  
X Ray Diffraction ◽  
X Ray

D051 Investigation of nano-scale deformation mechanisms in metallic multilayers by in-situ synchrotron X-ray diffraction

2006 ◽  
Vol 21 (2) ◽  
pp. 175-175
Author(s):  
C. C. Aydiner ◽  
D. W. Brown ◽  
S. Vogel ◽  
Y. C. Wang ◽  
A. Misra ◽  
...  
Keyword(s):  
Deformation Mechanisms ◽  
Metallic Multilayers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Scale
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