scholarly journals Habit planes of twins in a deformed Mg alloy determined from three-dimensional microstructure analysis

2020 ◽  
Vol 159 ◽  
pp. 110014 ◽  
Author(s):  
Farangis Ram ◽  
Jeffrey T. Lloyd ◽  
Gregory S. Rohrer
Keyword(s):  
Three Dimensional ◽  
Microstructure Analysis ◽  
Mg Alloy ◽  
Habit Planes

A Dislocation-Based Crystal Plasticity Simulation on Kink Band Formation and Evolution in Polycrystalline Mg Alloy with LPSO Phase

2014 ◽  
Vol 626 ◽  
pp. 281-286 ◽  
Author(s):  
Ryo Ueta ◽  
Kazuyuki Shizawa
Keyword(s):  
Crystal Plasticity ◽  
Three Dimensional ◽  
Kink Band ◽  
Mg Alloy ◽  
Shear Stresses ◽  
Band Formation ◽  
Polycrystalline Specimen ◽  
Lpso Phase ◽  
Crystal Plasticity Model ◽  
Formation And Evolution

A three-dimensional compression analysis is performed by finite element method using a dislocation-based crystal plasticity model to clarify the formation mechanism of kink band in a polycrystalline Mg alloy with a long-period stacking ordered structure (LPSO) phase. The crystalline structure of LPSO phase is regarded as a HCP for simplicity, however, any deformation twinning is not taken into account. In addition, the activities of non-basal systems are considerably limited in the LPSO phase setting the values of their critical resolved shear stresses to large ones. We analyze a simple polycrystalline specimen composed of two α-Mg matrix phases and a LPSO phase both having a rectangular shape and twist grain boundaries are introduced into the interface. The obtained result shows that the kink band formation in the alloy is accomplished by the basal slips with different variants and the non-basal slips are activated on the grain boundary to maintain the continuity of deformation.

The softening effect of heat-treated strengthened Al–Zn–Mg alloy in welding process

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744039
Author(s):  
Xiaohong Zhang ◽  
Jingqing Chen ◽  
Kang Zhang ◽  
Hui Chen
Keyword(s):  
Welding Process ◽  
Phase Changes ◽  
Microstructure Analysis ◽  
Peak Temperature ◽  
Mg Alloy ◽  
Thermal Cycles ◽  
Softening Effect ◽  
Multipass Welding ◽  
Softening Mechanism ◽  
Heat Treated

Weld joint softening occurs during the welding process of heat-treatable aluminum alloys and strongly influences the mechanical properties. In this work, the softening of heat-treated Al–Zn–Mg alloy was studied in the multipass welding process. By Gleeble-3500 thermal–mechanical simulator, the heat treatment and tensile test with welding thermal cycles were carried out to simulate the microstructure evolution and mechanical softening during multipass welding. After that, the softening mechanism of the HAZ was analyzed by microstructure analysis. The results indicate that the heat-treated Al–Zn–Mg alloy exhibited obvious softening after several thermal cycles with peak temperature higher than 200[Formula: see text]C, and this phenomenon is worse with increasing peak temperature. Based on the microstructure analysis, it was found that the reinforcement phase changes according to the applied thermal cycles, which strongly affects the strength of Al–Zn–Mg alloys.

Three-dimensional microstructure analysis of a polymer electrolyte membrane water electrolyzer anode

2018 ◽  
Vol 393 ◽  
pp. 62-66 ◽  
Author(s):  
Friedemann Hegge ◽  
Riko Moroni ◽  
Patrick Trinke ◽  
Boris Bensmann ◽  
Richard Hanke-Rauschenbach ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Three Dimensional ◽  
Microstructure Analysis ◽  
Electrolyte Membrane

Reasons for Formation of Twin-Precipitates in Two Phase Stainless Steel

2010 ◽  
Vol 638-642 ◽  
pp. 3004-3008
Author(s):  
Naoki Miyano ◽  
Akihiro Takahashi ◽  
Seigo Kataoka ◽  
Kei Ameyama
Keyword(s):  
Stainless Steel ◽  
Elastic Strain ◽  
Coincidence Site Lattice ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Two Phase ◽  
Precipitate Shape ◽  
Properties Of Materials ◽  
Anisotropic Elastic ◽  
Habit Planes

This study focuses on the entire shape of the  twin-precipitate in two phase stainless steel, Fe-25Cr-6Ni in terms of the interphase and elastic strain energies generated between the precipitate and matrix. An investigation of this precipitation is important not only in terms of microstructure control but also for improving the mechanical properties of materials. Firstly, the three-dimensional near-coincidence site lattice (3D-NCS) model, which is based on the atomic matching model, is applied for estimating the preferred habit planes by evaluating the result of geometrical atomic matching. Subsequently, the precipitate shape is determined from candidates of the preferred habit plane produced by the 3D-NCS model, and the elastic strain surrounding and within the precipitate is investigated by FEM analysis, which can calculate the anisotropic elastic strain depending on the shape of the precipitate. The results are compared with observed precipitate by TEM.

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