scholarly journals Forgeability and Flow Stress of Mg-Zn-Y Alloys with Long Period Stacking Ordered Structure at Elevated Temperatures

2009 ◽  
Vol 50 (4) ◽  
pp. 841-846 ◽  
Author(s):  
Ryo Matsumoto ◽  
Michiaki Yamasaki ◽  
Masaaki Otsu ◽  
Yoshihito Kawamura
Keyword(s):  
Flow Stress ◽  
Elevated Temperatures ◽  
Ordered Structure ◽  
Long Period

Microfracture behaviour of extruded Mg–Zn–Y alloys containing long-period stacking ordered structure at room and elevated temperatures

2013 ◽  
Vol 570 ◽  
pp. 63-69 ◽  
Author(s):  
Yoji Mine ◽  
Hajime Yoshimura ◽  
Mitsuhiro Matsuda ◽  
Kazuki Takashima ◽  
Yoshihito Kawamura
Keyword(s):  
Elevated Temperatures ◽  
Ordered Structure ◽  
Long Period

The Effect of EMS on the Microstructure of LPSO Mg-Zn-Y Cast Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 1117-1121 ◽  
Author(s):  
H. Akiyama ◽  
Yoshihito Kawamura
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Large Scale ◽  
Elevated Temperatures ◽  
Cast Alloy ◽  
Size Difference ◽  
Ordered Structure ◽  
Homogeneous Microstructure ◽  
Long Period ◽  
Casting Technology

In this study, long period stacking ordered structure (LPSO) type magnesium alloys have been developed. They consist of LPSO phase and α-Mg phase and have excellent mechanical properties at both ambient and elevated temperatures. In the present study, the influence of electromagnetic stir (EMS) on the structure of LPSO type Mg96Zn2Y2 (at. %) billets of φ200 mm in diameter was investigated in order to establish the large-scale casting technology of LPSO type Mg alloy. EMS refined the grain size of α-Mg up to approximately 1/3.5, and reduced the size difference between the surface and the center of the billets. By applying EMS, it was found possible to provide large-scale casting billets with fine and homogeneous microstructure.

A high-strength extruded Mg–Gd–Zn–Zr alloy with superplasticity

2009 ◽  
Vol 24 (12) ◽  
pp. 3596-3602 ◽  
Author(s):  
Y.J. Wu ◽  
L.M. Peng ◽  
X.Q. Zeng ◽  
D.L. Lin ◽  
W.J. Ding
Keyword(s):  
Mechanical Properties ◽  
Grain Boundaries ◽  
Elevated Temperatures ◽  
High Strength ◽  
Ingot Metallurgy ◽  
Ordered Structure ◽  
Superplastic Behavior ◽  
Long Period ◽  
Conventional Ingot ◽  
Zr Alloy

This article presents an extruded Mg–Gd–Zn–Zr alloy produced by conventional ingot metallurgy, exhibiting high-strength and excellent ductility at room and elevated temperatures. The superplastic behavior was observed in the Mg–Gd–Zn (–Zr) alloy at elevated temperatures above 573 K. In the alloy, both the X phase in grain boundaries and the lamellae within matrix have the 14H-type long-period, stacking-ordered structure. It indicates that the X phase and the lamellae within matrix play important roles in the excellent mechanical properties.

Determining Deformation Behavior of AISI 9310 Steel Varying Temperature and Strain Rate for Aerospace Applications

2021 ◽  
Author(s):  
Adanma Akoma ◽  
Kevin Sala ◽  
Chase Sheeley ◽  
Lesley D. Frame
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Elevated Temperatures ◽  
Test Sample ◽  
Material Behavior ◽  
Image Correlation ◽  
Sample Length ◽  
Stress Behavior ◽  
Flow Stress Behavior ◽  
The Impact

Abstract Determination of flow stress behavior of materials is a critical aspect of understanding and predicting behavior of materials during manufacturing and use. However, accurately capturing the flow stress behavior of a material at different strain rates and temperatures can be challenging. Non-uniform deformation and thermal gradients within the test sample make it difficult to match test results directly to constitutive equations that describe the material behavior. In this study, we have tested AISI 9310 steel using a Gleeble 3500 physical simulator and Digital Image Correlation system to capture transient mechanical properties at elevated temperatures (300°C – 600°C) while controlling strain rate (0.01 s-1 to 0.1 s-1). The data presented here illustrate the benefit of capturing non-uniform plastic strain of the test specimens along the sample length, and we characterize the differences between different test modes and the impact of the resulting data that describe the flow stress behavior.

On the Size Effects in Micro/Meso Upsetting of Brass H62 at Elevated Temperatures

2014 ◽  
Vol 621 ◽  
pp. 158-164
Author(s):  
Hao Yan Wang ◽  
Zhe He Yao ◽  
De Qing Mei
Keyword(s):  
Flow Stress ◽  
Sample Size ◽  
Size Effects ◽  
Metal Forming ◽  
Room Temperature ◽  
Production Efficiency ◽  
Elevated Temperatures ◽  
Processing Temperature ◽  
High Production ◽  
Scaling Down

Micro/meso forming, as an emerging manufacturing process for miniature metallic workpieces, has attracted great attention since the 1990s due to its high production efficiency, low material waste and high precision. Due to the so-called size effects in the scaling down, many traditional theories in metal forming cannot be simply applied to the micro/meso forming. In this study, the micro/meso upsetting experiments of Brass H62 were conducted at various temperatures. The stress−strain curves in the experiments were measured and compared. The effects of the temperature and the sample size on the flow stress were discussed. It is found that the flow stress of the material decreased with the decrease of the sample size at room temperature. However, the flow stress of the material may increase with the decrease of the sample size at elevated temperatures. The results indicate that the size effects in the micro/meso forming are significantly affected by the processing temperature.

Research into the Flow Stress of Al-Mg-Si Alloy (AD-35) during the Abrupt Change of the Strain Rate at Elevated Temperatures

2013 ◽  
Vol 554-557 ◽  
pp. 1099-1104 ◽  
Author(s):  
Pavel A. Petrov ◽  
Viktor Voronkov ◽  
Konstantin Potapenko ◽  
Mikhail Petrov ◽  
Olga Gamzina
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Elevated Temperatures ◽  
Abrupt Change ◽  
Hot Forging ◽  
Experimental Investigations ◽  
Engineering Strain ◽  
Industrial Practice ◽  
Transient Change ◽  
Forging Process

In industrial practice of rolling and hot forging, i.e. extrusion-type forging, abruptchanges in strain rate during the deformation of the material occur. For accurate numericalsimulation of a forging process, the experimental investigation of the effect of the transient changein strain rate on plastic flow behaviour is necessary. The present paper deals with the investigationof this effect on the flow stress of an AD-35 aluminium alloy during its deformation within thetemperature range of 350-450 °C. During continuous uniaxial compression loading of a cylindricalspecimen, the strain rate was either constant or abruptly increased or decreased from its initial valueat engineering strain of app. 26 %. The following strain-rate histories were applied: 1) constantstrain rate of 0.1, 1.0 and 10 s-1; 2) abrupt strain-rate increasing from 1.0 to 10.0 s-1; 3) abrupt strainratedecreasing from 10.0 to 1.0 s-1. The results of the experimental investigations corresponded tothe transient change in strain rate histories were used to verify the model of softening as well as themodel of hardening of the AD-35 alloy during the abrupt change of the strain rate. It allows todefine these models explicitly.

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