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mechanical-twinning
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Effect of thermomechanical parameters on texture of 90-10 brass sheets
, Article 14th International Conference on Textures of Materials, ICOTOM 14, Leuven, 11 July 2005 through 15 July 2005 ; Volume 495-497, Issue PART 1 , 2005 , Pages 755-760 ; 02555476 (ISSN); 087849975X (ISBN); 9780878499755 (ISBN) ; Akbarzadeh, A ; Saffari, M. M ; Sharif University of Technology
Trans Tech Publications Ltd
2005
Abstract
Optimized conditions of hot and cold rolling followed by annealing can result in a balance between recrystallization and rolling textures in order to reduce the planar anisotropy of brass sheets. In this work, the effect of finish rolling temperature, cold reduction and annealing temperature on texture development has been investigated. It is shown that uniform deformation at higher finishing temperature is responsible of formation of a severe Cube and G texture components. In contrast, mechanical twinnings are widely formed at low finishing temperatures. There is also a direct relation between the intensity of Cube component and the amount of cold reduction
Linear Hardening in FCC Alloys
, Ph.D. Dissertation Sharif University of Technology ; Asgari, Sirous (Supervisor)
Abstract
Previous observation and models on the origin of linear hardening behavior in FCC polycrystals are critically reviewed. To reveal the draw backs of the previous models, selected results of an investigation on the evolution of microstructure during simple compression testing of two FCC polycrystals, Inconel 625 superalloy and AISI 316L stainless steel are reported. It is found that while a number of FCC polycrystals show linear hardening behavior, the evolution of the underlying microstructure may be quite different. It is argued that, in contrast to the current belief, deformation twinning may not be the sole cause of linear hardening in low SFE FCC polycrystals. It is suggested that only...
Microstructure and phase transformation behavior of a stress-assisted heat-treated Ti-Rich NiTi shape memory alloy
, Article Journal of Materials Engineering and Performance ; Volume 21, Issue 8 , August , 2012 , Pages 1806-1812 ; 10599495 (ISSN) ; Rezaei, E ; Sharif University of Technology
Springer
2012
Abstract
In this study, the effects of stress-assisted heat treatment on the microstructure and phase transformation of a Ti-rich (Ti-49.52 at.% Ni) shape memory alloy were investigated. For this purpose, the alloy was heat treated at temperature of 500 °C for 10 h under applied stresses of 100 and 200 MPa. XRD, TEM, and repeated thermal cycling were employed to study the microstructure and transformation behavior of the heat-treated materials. Room temperature XRD diffractogram of the stress-free heat-treated material showed a weak reflection of austenite (B2), while that for the stress-assisted heat-treated materials had a high intensity implying the presence of residual austenite in the...
Effects of rolling reduction on mechanical properties anisotropy of commercially pure titanium
, Article Materials and Design ; Volume 34 , 2012 , Pages 268-274 ; 02641275 (ISSN) ; Ekrami, A ; Ziaei Moayyed, A. A ; Shohani, M ; Sharif University of Technology
Abstract
In the present work tensile and tear properties of commercially pure titanium with different rolling reductions and specimens directions were investigated. The experimental results showed that in low levels of deformation the microstructure refining and mechanical twins have fewer significant effects on the anisotropic behavior of both tear and tensile properties and the crystallographic texture controls the mechanical properties anisotropy. The increase in rolling reduction up to 50% led to the formation of strong-basal texture and resulted in the activation of almost same deformation systems and isotropic mechanical response. However, at high levels of deformation, due to the split...