scholarly journals Transition in Deformation Mechanism of AZ31 Magnesium Alloy during High-Temperature Tensile Deformation

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Masafumi Noda ◽  
Hisashi Mori ◽  
Kunio Funami
Keyword(s):  
High Temperature ◽  
Deformation Mechanism ◽  
Tensile Deformation ◽  
Initial Strain Rate ◽  
Grain Boundary Sliding ◽  
Mg Alloy ◽  
Uniaxial Tensile ◽  
Specific Strength ◽  
Az31 Mg Alloy ◽  
High Temperature Tensile

Magnesium alloys can be used for reducing the weight of various structural products, because of their high specific strength. They have attracted considerable attention as materials with a reduced environmental load, since they help to save both resources and energy. In order to use Mg alloys for manufacturing vehicles, it is important to investigate the deformation mechanism and transition point for optimizing the material and vehicle design. In this study, we investigated the transition of the deformation mechanism during the high-temperature uniaxial tensile deformation of the AZ31 Mg alloy. At a test temperature of 523 K and an initial strain rate of 3×10−3 s-1, the AZ31 Mg alloy (mean grain size: ~5 μm) exhibited stable deformation behavior and the deformation mechanism changed to one dominated by grain boundary sliding.

High-Temperature-Tensile-Deformation Behavior of Ti-6Al-4V Alloy with the Acicular α′ Martensite Microstructure

2016 ◽  
Vol 838-839 ◽  
pp. 243-248 ◽  
Author(s):  
Takuro Nishihara ◽  
Hiroaki Matsumoto ◽  
Yohei Iwagaki ◽  
Tohru Shiraishi ◽  
Yoshiki Ono
Keyword(s):  
High Temperature ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Tensile Elongation ◽  
Rate Sensitivity ◽  
Specific Strength ◽  
High Specific Strength ◽  
Tensile Deformation Behavior ◽  
High Temperature Tensile ◽  
Martensite Microstructure

Titanium alloys are widely used in aerospace components, with the most widely used alloy being (α+β)-type Ti-6Al-4V (hereafter designated as Ti-64) alloy owing to its high specific strength and high formability associated with superplasticity. This work examines the tensile deformation behavior of the Ti-64 alloy with the acicular α′ martensite microstructure tested at from 700°C to 900°C. Higher tensile-elongation and higher strain-rate-sensitivity value are seen in the Ti-64 alloy with the α′ martensite microstructure as compared to that with the lamellar (α+β) microstructure. During deformation of the α′ martensite microstructure at 700°C or 800°C, acicular microstructure evolves into fine equiaxed (α+β) structure, whereas there is no apparent change in microstructure in the case of the lamellar (α+β) starting microstructure. This result indicates that dynamic globularization during deformation is strongly enhanced in the acicular α′ martensite starting microstructure, thereby leading to higher tensile elongation.

High-Temperature Tensile Deformation of Glass-Doped 3Y-TZP

2000 ◽  
Vol 83 (12) ◽  
pp. 3095-3099 ◽  
Author(s):  
Philip H. Imamura ◽  
Neal D. Evans ◽  
Taketo Sakuma ◽  
Martha L. Mecartney
Keyword(s):  
High Temperature ◽  
Tensile Deformation ◽  
High Temperature Tensile

Oxidation Effects during High Temperature Deformation of CP Ti Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 3678-3683
Author(s):  
Ming Jen Tan ◽  
X.J. Zhu ◽  
S. Thiruvarudchelvan ◽  
K.M. Liew
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
High Temperatures ◽  
Pure Titanium ◽  
Initial Strain Rate ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Uniaxial Tensile ◽  
Commercially Pure Titanium ◽  
Commercially Pure

This work reports the influence of oxidation on the superplasticity of commercially pure titanium at high temperatures. Uniaxial tensile tests were conducted at temperatures in the range 600-800°C with an initial strain rate of 10s-1 to 10s-3. This study shows that oxidization at the surface of the alloy causes oxide film on the surface of commercially pure titanium alloy, and the thickness of oxide film increase with increasing exposure time and temperature. XRD analysis shows that the oxide film consists of TiO2. Because this oxide film is very brittle, it can induce clefts and degrade the ductility of the titanium at high temperatures. The mechanism of the initial clefts was investigated and a model for the cleft initiation and propagation during high temperature tensile test was proposed.

Variant selection of {10-12}-{10-12} double twins during the tensile deformation of an AZ31 Mg alloy

2017 ◽  
Vol 700 ◽  
pp. 226-233 ◽  
Author(s):  
Renlong Xin ◽  
Changfa Guo ◽  
John J. Jonas ◽  
Gang Chen ◽  
Qing Liu
Keyword(s):  
Tensile Deformation ◽  
Mg Alloy ◽  
Variant Selection ◽  
Az31 Mg Alloy ◽  
Selection Of

scholarly journals An Experimental Study of the Tension-Compression Asymmetry of Extruded Ti-6.5Al-2Zr-1Mo-1V under Quasi-Static Conditions at High Temperature

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1299
Author(s):  
Chen Zhang ◽  
Dongsheng Li ◽  
Xiaoqiang Li ◽  
Yong Li
Keyword(s):  
High Temperature ◽  
Strain Hardening ◽  
Yield Stress ◽  
Mechanical Response ◽  
Tensile Deformation ◽  
Uniaxial Tensile ◽  
Tensile Direction ◽  
Stress Asymmetry ◽  
Static Conditions ◽  
Tension Compression Asymmetry

The tension-compression asymmetry (TCA) behavior of an extruded titanium alloy at high temperatures has been investigated experimentally in this study. Uniaxial tensile and compressive tests were conducted from 923 to 1023 K with various strain rates under quasi-static conditions. The corresponding yield stress and asymmetric strain hardening behavior were obtained and analyzed. In addition, the microstructure at different temperatures and stress states indicates that the extruded TA15 profile exhibits a significant yield stress asymmetry at different testing temperatures. The flow stress and yield stress during tension are greater than compression. The yield stress asymmetry decreases with the increase in temperature. The alloy also exhibits TCA behavior on the strain hardening rate. Its mechanical response during compression is more sensitive than tension. A dynamic recrystallization phenomenon is observed instead of twin generated in tension and compression under high-temperature quasi-static conditions. The grains are elongated along the tensile direction and deformed by about 45° along the compressive load axis. Finally, the TCA of Ti-6.5Al-2Zr-1Mo-1V (TA15) alloy is due to slip displacement. The tensile deformation activates basal <a>, prismatic <a> and pyramidal <c + a> slip modes, while the compressive deformation activates only prismatic <a> and pyramidal <c + a> slip modes.

Effect of Mo Addition on Room and High Temperature Tensile Behavior of Al-Si-Cu-Mg Alloy in As-Cast and Heat-Treated Conditions

2019 ◽  
Vol 1155 ◽  
pp. 71-79
Author(s):  
Mohammadreza Zamani ◽  
Stefania Toschi ◽  
Alessandro Morri ◽  
Lorella Ceschini ◽  
Salem Seifeddine
Keyword(s):  
High Temperature ◽  
Tensile Behavior ◽  
Mg Alloy ◽  
High Melting Point ◽  
Treated Condition ◽  
Heat Treated ◽  
Heat Treated Condition ◽  
High Temperature Tensile ◽  
Negligible Influence

This study focuses on the role of Mo addition on the mechanical properties of an Al-Si-Cu-Mg alloy in as-cast and heat-treated condition at ambient and elevated temperature. Addition of 0.4 to 0.6 wt.% Mo forms Mo-bearing dispersoid particles which have a relatively high melting point and improve high temperature tensile strength. Ductility suffered in the presence of Mo-bearing particles. Trace addition of Mo up to 0.6 wt.% has a negligible influence on the yield strength and hardness of Al-Si-Cu-Mg alloy in as-cast and heat-treated conditions at ambient temperature and 250 °C.

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