Aging Property of AZ91D Magnesium Alloy Screw Thread-Rolled at Room Temperature Using Extrusion-Torsion Simultaneous Processing

2016 ◽  
Vol 879 ◽  
pp. 2450-2455
Author(s):  
Mitsuaki Furui ◽  
Shouyou Sakashita ◽  
Shougo Suzuki ◽  
Tetsuo Aida ◽  
Yuusuke Ishisaka ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Aging Treatment ◽  
High Strength ◽  
Extrusion Process ◽  
Peak Hardness ◽  
Screw Thread ◽  
Az91d Magnesium Alloy ◽  
Simultaneous Processing ◽  
Aging Property

We have proposed a new extrusion process functionally combined with torsion. Extrusion-torsion simultaneous processing is a very attractive technique for fabricating a rod-shape material with high strength and excellent workability. To improve the hardness, the aging treatment was performed with AZ91D magnesium alloy screw thread-rolled at room temperature using extrusion-torsion simultaneous processing. The distribution of hardness from the tip to center in as thread-rolled screw was modified to uniform distribution by the isothermal aging treatment at 423 K for 460.8 ks. The peak hardness was not depended on the working temperature and rotation speed during extrusion-torsion simultaneous processing. β-Mg17Al12 precipitates are obviously grown in as peak-aged condition comparing with as thread-rolled condition.

Room Temperature Screw Form Rolling of AZ91D Magnesium Alloy through Processing by Extrusion-Torsion Simultaneous Working

2014 ◽  
Vol 783-786 ◽  
pp. 375-379
Author(s):  
Mitsuaki Furui ◽  
Shouyou Sakashita ◽  
Kazuya Shimojima ◽  
Tetsuo Aida ◽  
Kiyoshi Terayama ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Hardness Measurement ◽  
Rolling Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
Microstructure Observation ◽  
Fine Grain ◽  
Simultaneous Processing

Extrusion-torsion simultaneous processing is a very attractive technique for fabricating a rod-shape material with fine grain and random texture. We have proposed a new screw form rolling process combined with preliminary extrusion-torsion simultaneous working. Microstructure evolution and mechanical property change of AZ91D magnesium alloy during extrusion-torsion simultaneous processing was examined through microstructure observation, X-ray diffraction analysis and micro-Vickers hardness measurement. By the addition of torsion, the crystal orientation of AZ91D magnesium alloy workpiece was drastically changed from basal crystalline orientation to the random orientation. Crystal grain occurred through the dynamic recrystallization and tended to coarsen with an increase of extrusion-torsion temperature. Grain refinement under 2 um was achieved at the lowest extrusion-torsion temperature of 523 K. M8 gauge AZ91D magnesium alloy screw was successfully formed at room temperature using the extrusion-twisted workpiece preliminary solution treating at 678 K for 345.6 ks. It was found that the extrusion-torsion temperature of 678 K must be selected to fabricate the good screw without any defects.

scholarly journals T4 and T6 Treatment of 6061 Al-15 Vol. % SiCP Composite

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
S. Rajasekaran ◽  
N. K. Udayashankar ◽  
Jagannath Nayak
Keyword(s):  
Room Temperature ◽  
Artificial Aging ◽  
Brinell Hardness ◽  
Natural Aging ◽  
Aging Treatment ◽  
Temperature History ◽  
Peak Hardness ◽  
Aging Behavior ◽  
Hardness Variation ◽  
Peak Aging

Aging temperature history has profound effect on the mechanical and corrosion behavior of 6061 Al/SiC composite. In order to understand the effect of aging on the corrosion resistance, the natural and artificial aging behavior of 15 vol. % 6061 Al-SiCP composites was studied using the aging treatment and the Brinell hardness measurements. The aging curves for the composite (T6 treated) were determined at various aging temperatures such as room temperature, 140, 160, 180, 200, 220, and 240°C. According to the peak hardness variation with temperature profile, it is found that the composite is underaged at 140°C and 160°C. Peak aging takes place at 180°C. Overaging takes place at 200°C, 220°C, and 240°C. The natural aging characteristics of the composite (T4 treated) are also studied using the Brinell hardness measurements.

Fatigue Property of High-Strength Carbon Steel Deformed by Repetitive Side Extrusion Process

2005 ◽  
Vol 475-479 ◽  
pp. 245-248 ◽  
Author(s):  
Koshiro Aoki ◽  
Akira Azushima ◽  
Yoshiyuki Kondo
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Room Temperature ◽  
Lateral Pressure ◽  
Treatment Time ◽  
Fatigue Property ◽  
High Strength ◽  
Extrusion Process ◽  
Ultrafine Grained ◽  
Better Than

The development of an ultrafine grained carbon steel during repetitive shear deformation of side extrusion and the properties after heat treatment were investigated. Side extrusions were carried out at room temperature and the used material was 0.50% carbon steel. The repetitive side extrusions with a constant lateral pressure were carried out up to 3 passes without rotation. The specimens of these steels after 3 passes were annealed at a constant temperature of 600°C changing the treatment time. After side extrusion and heat treatment, the fatigue property was better than that of the as-received material.

Research on Thixoforging Magazine Plate of AZ91D Magnesium Alloy in Semi-Solid State

2006 ◽  
Vol 116-117 ◽  
pp. 267-270 ◽  
Author(s):  
Ju Fu Jiang ◽  
Shou Jing Luo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Solid State ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Great Influence ◽  
Technological Parameters ◽  
Az91d Magnesium Alloy ◽  
Preheating Temperature ◽  
Semi Solid

The thixoforging process in which magazine plates of AZ91D magnesium alloy were thixoforged in semi-solid state using semi-solid billets prepared by common SIMA method and new SIMA method was investigated. The results show that the pressure has a great influence on the semi-solid billet’s ability to fill die’s cavity. When the pressure is 500KN, the semi-solid billet can’t fill the die’s cavity completely. When the pressure is 2000KN, the semi-solid billet can fill the die’s cavity completely. Room temperature mechanical properties, such as yield strength of 201.4MPa, ultimate tensile strength of 321.8MPa and elongation of 15.3%, can be obtained successfully when the technological parameters, including pressure of 200KN, die preheating temperature of 723K, holding for 20min at 818K, are satisfied. Comparing with common SIMA, mechanical properties of room temperature and high temperature at 373Kare enhanced heavily.

Vacuum Distillation Refining and Extrusion Process of Magnesium

2005 ◽  
Vol 475-479 ◽  
pp. 513-516 ◽  
Author(s):  
Makoto Inoue ◽  
T. Doi ◽  
Tetsuo Aida ◽  
Kenji Matsuki ◽  
Shigeharu Kamado ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Vacuum Distillation ◽  
Extrusion Process ◽  
High Ductility ◽  
Good Corrosion Resistance ◽  
Az91d Magnesium Alloy ◽  
Die Castings

In this study, it refined by the vacuum distilling refining and the billet was produced for the obtained 99.99% or more of purity magnesium deposit by compression forming, extrusion process was performed and the corrosion resistance of extrusions and the tensile characteristic which were acquired were investigated. The specimen showed good corrosion resistance rather than commercial AZ91D magnesium alloy die-castings. The specimen has high ductility and it is good, and compared with 99.9% of purity magnesium.

Microstructure Evolution of AZ91D Magnesium Alloy during Extrusion-Torsion Simultaneous Processing

PRICM ◽  
2013 ◽  
pp. 1323-1328 ◽  
Author(s):  
Mitsuaki Furui ◽  
Shoyo Sakashita ◽  
Kazuya Shimojima ◽  
Tetsuo Aida ◽  
Kiyoshi Terayama ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Microstructure Evolution ◽  
Az91d Magnesium Alloy ◽  
Simultaneous Processing

Evaluation of Variation Mechanical Properties in AZ91D Magnesium Alloy Processed by Extrusion and ECAP

2013 ◽  
Vol 753-755 ◽  
pp. 191-194
Author(s):  
Bao Zhi Xie
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Tensile Testing ◽  
Room Temperature ◽  
Initial Strain Rate ◽  
Maximum Elongation ◽  
Az91d Magnesium Alloy ◽  
Superplastic Properties

Microstructure evolution and mechanical properties of AZ91D magnesium alloys which was processed by EX-ECAP at 473K were investigated in this study. Microstructural inspection showed that the EX-ECAP was effective in refine grain size of the alloy. Tensile testing at room temperature showed that the ductility, strength and hardness of the alloy have been significantly increased by EX-ECAP. The alloy exhibited excellent superplastic properties in the form of the maximum elongation of ~218% at 473K using an initial strain rate of 3×10-4s-1.

Microstructure and Mechanical Properties of Magnesium Alloy AZ81 with Yttrium

2010 ◽  
Vol 152-153 ◽  
pp. 197-201 ◽  
Author(s):  
Qing Zhang ◽  
Quan An Li ◽  
Xiao Tian Jing ◽  
Xing Yuan Zhang
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Aging Treatment ◽  
Tensile Tests ◽  
Phase Lead ◽  
Microstructure And Mechanical Properties ◽  
Yttrium Addition ◽  
Mg17al12 Phase ◽  
Alloy Increase

The effects of yttrium on the microstructure and mechanical properties of magnesium alloy AZ81 have been investigated by alloy preparation, microstructure analysis and tensile tests. The results show that proper content of yttrium addition can obviously refine the microstructure of magnesium alloy AZ81, reduce the amount of β-Mg17Al12 phase, lead to the precipitation of Al2Y phase and improve the mechanical properties. After solid solution and aging treatment, the tensile strength and elongation of the alloy increase at first and then decrease with the increase of yttrium content, and reach the maxima at 2%Y. At room temperature, the maxima are 277MPa and 10.9% respectively. At 150 , the maxima are 220MPa and 12.4% respectively.

WEAR RESISTANCE OF AZ91D MAGNESIUM ALLOY WITH AND WITHOUT MICROARC OXIDATION COATING AND Ti6Al4V ALLOY IN ARTIFICIAL SALIVA

2009 ◽  
Vol 16 (06) ◽  
pp. 821-830 ◽  
Author(s):  
X. P. ZHANG ◽  
Y. S. ZOU ◽  
F. M. WU ◽  
Z. P. ZHAO ◽  
L. YOU ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Wear Mechanisms ◽  
Room Temperature ◽  
Artificial Saliva ◽  
Microarc Oxidation ◽  
Alloy Sample ◽  
Az91d Alloy ◽  
Oxidation Treatment ◽  
Az91d Magnesium Alloy

The wear resistances of AZ91D magnesium alloy with and without microarc oxidation (MAO) coating and Ti 6 Al 4 V alloy in artificial saliva were investigated at room temperature. The wear resistance of AZ91D magnesium alloy in artificial saliva was significantly improved after microarc oxidation treatment. The volume loss of untreated AZ91D magnesium alloy sample was 20.95 times of that of AZ91D magnesium alloy with MAO coating, and that of Ti 6 Al 4 V was 5.42 times of that of MAO. Furthermore, the wear resistance of AZ91D magnesium alloy was lower than that of Ti 6 Al 4 V alloy in artificial saliva. The wear mechanisms of AZ91D magnesium and Ti 6 Al 4 V were discussed. It was found that the wear mechanism of the MAO was associated with abrasion and microfracture. There were two dominative wear mechanisms for AZ91D alloy and Ti 6 Al 4 V alloy under the loading conditions used in the experiment, namely, micro-machining wear and deformation-induced wear.

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