Effect of Zn Contents on Microstructure in AZ-Series Magnesium Alloys

2011 ◽  
Vol 409 ◽  
pp. 358-361 ◽  
Author(s):  
Yuichi Narukawa ◽  
Katsumi Watanabe ◽  
Kenji Matsuda ◽  
Tokimasa Kawabata ◽  
Susumu Ikeno
Keyword(s):  
Magnesium Alloys ◽  
Hardness Test ◽  
Alloy System ◽  
Al Alloys ◽  
Age Hardening ◽  
Al Alloy ◽  
Moderate Increase ◽  
Hardening Behavior ◽  
The Matrix ◽  
The Difference

Magnesium alloys containing Al have been used for industrial materials due to their lightweight and recyclability. The Mg-Al alloys are usually used for the industrial production. The Mg-Al alloys are divided into AZ-series alloys with the addition of Zn, and AM-series alloys with the addition of Mn, respectively. The addition of Zn to the Mg-Al alloy system reduces the solid solubility of Al in Mg, increases the amount of precipitate phases after ageing and thus causes a moderate increase in strength. The Mg17Al12phase (γ) is reported as the precipitate formed in the Mg-Al alloys during aging after the solution heat treatment, which is the discontinuous precipitate in the grain boundary and continuous precipitate in the matrix. However, there is few report about the effect of Zn contents on age-hardening behavior and microstructure of AZ-series alloys. The propose of this study is to investigate the difference of the age-hardening behavior and microstructures of AZ-series alloys using hardness test and scanning electron microscopy (SEM) observation.

Effect of Al and Mn Contents on Microstructure in AM-Series Magnesium Alloys

2011 ◽  
Vol 409 ◽  
pp. 379-382 ◽  
Author(s):  
Taiki Tsuchiya ◽  
Katsumi Watanabe ◽  
Kenji Matsuda ◽  
Tokimasa Kawabata ◽  
Katsuya Sakakibara ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Solution Heat Treatment ◽  
Hardness Test ◽  
Al Alloys ◽  
Age Hardening ◽  
Absorption Properties ◽  
Hardening Behavior ◽  
The Matrix ◽  
The Difference ◽  
Impact Absorption

Magnesium alloys containing aluminum have been used for industrial materials due to their lightweight and recyclability. And the Mg-Al based alloys are usually used for the industrial production. The Mg17Al12 phase is reported as the precipitate formed in the Mg-Al alloys during aging after the solution heat treatment, which is the discontinuous precipitate in the grain boundary and continuous precipitate in the matrix. The Mg-Al alloys are divided into AZ-series alloys with the addition of Zn, and AM-series alloys with the addition of Mn, respectively. AM-series and AZ-series Mg-Al alloys have been used for industrial products widely, particularly for AM-series alloys because of better toughness and impact absorption properties than AZ-series alloys. However, there is few report about the effect of Al and Mn contents on age-hardening behavior and microstructure of AM-series alloys. The propose of this study is to investigate the difference of the age-hardening behavior and microstructures of AM-series alloys using hardness test and scanning electron microscopy (SEM) observation.

Effect of Casting Method and Al Contents on Microstructure in AM-Type Magnesium Alloys

2010 ◽  
Vol 654-656 ◽  
pp. 663-666 ◽  
Author(s):  
Katsumi Watanabe ◽  
Kenji Matsuda ◽  
Takumi Gonoji ◽  
Tokimasa Kawabata ◽  
Katsuya Sakakibara ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Hardness Test ◽  
Al Alloys ◽  
Age Hardening ◽  
Casting Method ◽  
Absorption Properties ◽  
Al Content ◽  
Hardening Behavior ◽  
The Difference ◽  
Impact Absorption

Magnesium alloys have received considerable attention because of their lightweight and recyclability. AM-type and AZ-type Mg-Al alloys have been used for industrial products widely, particularly for AM-type alloys because of the better toughness and impact absorption properties than AZ-type alloys. However, there is little report about the effect of casting method on age-hardening behavior and microstructure of AM-type alloys. The purpose of this study is to investigate the difference of the age-hardening behavior and microstructures of three AM-type alloys cast with steel, copper and sand molds using hardness test and scanning electron microscopy (SEM) observation. Furthermore, the effect of Al content is also investigated in this study using three alloys of AM30 (3%Al), AM60 (6%Al) and AM90 (9%Al).

Direct Cladding from Molten Metals of Aluminum and Magnesium Alloys Using a Tandem Horizontal Twin Roll Caster

2015 ◽  
Vol 772 ◽  
pp. 250-256 ◽  
Author(s):  
Hideto Harada ◽  
Shin Ichi Nishida ◽  
Mayumi Suzuki ◽  
Hisaki Watari ◽  
T. Haga
Keyword(s):  
Surface Condition ◽  
Hardness Test ◽  
Al Alloys ◽  
Mg Alloy ◽  
Al Alloy ◽  
Molten Metals ◽  
Electron Probe Micro Analyzer ◽  
Twin Roll Caster ◽  
Aluminum And Magnesium Alloys ◽  
Twin Roll

This paper describes direct cladding of magnesium (Mg) and aluminum (Al) alloys using a tandem horizontal twin roll caster that has three pairs of upper and lower rolls. Manufacturing conditions that are appropriate for fabricating Al/Mg and Al/Mg/Al cladded material were investigated. The surface condition of the cladded cast strip was examined. An electron probe micro analyzer was used to observe the interface between Al alloy and Mg alloy. The thickness of the mixed layer of Al and Mg alloy was 15μm, and how the materials were connected was clarified. Microscopic observation and backscattered electron analysis were used to investigate the cladding mechanisms of the Al and Mg alloy layers. Average hardness was determined using the Vickers hardness test at the Al layer and at the diffused layer between Mg and Al alloys. Cladding of Al/Mg alloy and A/Mg/Al alloy was possible using a tandem twin-roll caster. In addition, Al3Mg2 and Al12Mg17 phase precipitation at the interface of the Al and Mg alloys was confirmed during direct cladding from molten metals.

Asymmetric cryorolling of AA6061 Al alloy: Strain distribution, texture and age hardening behavior

2018 ◽  
Vol 736 ◽  
pp. 53-60 ◽  
Author(s):  
Danielle Cristina Camilo Magalhães ◽  
Andrea Madeira Kliauga ◽  
Maurizio Ferrante ◽  
Vitor Luiz Sordi
Keyword(s):  
Strain Distribution ◽  
Age Hardening ◽  
Al Alloy ◽  
Hardening Behavior

Age-hardening Behavior of MgB2 Particle Dispersed Al Alloy Composite Materials

2012 ◽  
pp. 1039-1042
Author(s):  
Chihaya Kawamoto ◽  
Kenji Matsuda ◽  
Satoshi Murakami ◽  
Daisuke Tokai ◽  
Tokimasa Kawabata ◽  
...  
Keyword(s):  
Composite Materials ◽  
Age Hardening ◽  
Al Alloy ◽  
Alloy Composite ◽  
Hardening Behavior

Effect of HPT on Age-Hardening Behavior in Cu-Added Excess Mg-Type Al-Mg-Si Alloys

2014 ◽  
Vol 922 ◽  
pp. 487-490
Author(s):  
Shun Maruno ◽  
Seiji Saikawa ◽  
Shoichi Hirosawa ◽  
T. Hamaoka ◽  
Z. Horita ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Pressure Torsion ◽  
Hardness Test ◽  
Age Hardening ◽  
Work Piece ◽  
Aging Behavior ◽  
Cross Sectional ◽  
Cross Sectional Dimension ◽  
The Matrix ◽  
Excess Mg

Severe plastic deformation (SPD) techniques such as high pressure torsion (HPT) have been extensively researched to achieve. SPD process makes use of the plastic deformation where no change in the cross-sectional dimension of a work piece occurs during straining.In this work, the effect of HPT on aging behavior and microstructure in excess Mg-type Al-Mg-Si alloys including Cu. These alloys were investigated by hardness test and TEM observation. The results show that processing by HPT leads to significant grain refinement with a grain size of ~250nm. Age-hardening phenomenon is observed at 343K and 373K for the Al-Mg-Si alloys with HPT. A few density of dislocation in the crystal grain was observed. The typical needle-shaped precipitates of Al-Mg-Si alloys were not observed in the matrix.

scholarly journals Effect of Two-Stage Homogenization Heat Treatment on Microstructure and Mechanical Properties of AA2060 Alloy

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 40
Author(s):  
Chaoyang Chaoyang ◽  
Guangjie Guangjie ◽  
Lingfei Lingfei ◽  
Fei Fei ◽  
Lin Lin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Cast Alloy ◽  
Hardness Test ◽  
Test Methods ◽  
Al Alloy ◽  
Two Stage ◽  
Homogenization Treatment ◽  
Transmission Electron ◽  
The Matrix

The microstructure evolution of AA2060 Al alloy containing Li during two-stage homogenization treatment was investigated by optical microscopy (OM), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), differential scanning calorimeter (DSC), transmission electron microscopy (TEM), mechanical properties and Vickers micro-hardness test methods. The results demonstrate that severe precipitation of θ(Al2Cu) and S(Al2CuMg) phase existed in the as-cast alloy, especially in the center position. Cu elements were concentrated at grain boundary and gradually decreased from the boundary to the interior. Numerous eutectic phases of θ(Al2Cu) and S (Al2CuMg) containing Zn and Ag elements were segregated at grain boundaries. The overheating temperature of the as-cast alloy is 497 °C. After two-stage homogenization treatment, the θ(Al2Cu) and S (Al2CuMg) in the surface, middle and center positions were completely dissolved into the matrix, thus achieved uniform homogenization effect. Moreover, water cooling could prevent the precipitation after homogenization, which provided good performance of the studied alloy. The optimum two-stage homogenization treatment of AA2060 alloy was 460 °C/4 h + 490 °C/2 4 h. The homogenization kinetic analysis was discussed as well.

TEM Observation for Precipitates Structure of Al-1.0Mass%Mg2Ge Alloys Aged at 473K

2014 ◽  
Vol 794-796 ◽  
pp. 992-995
Author(s):  
Akihiro Kawai ◽  
Keisuke Matsuura ◽  
Katsumi Watanabe ◽  
Kenji Matsuda ◽  
Susumu Ikeno
Keyword(s):  
Phase Diagram ◽  
Equilibrium Phase ◽  
Hardness Test ◽  
Age Hardening ◽  
Precipitation Sequence ◽  
Hardening Behavior ◽  
Β Phase ◽  
Hrtem Observation ◽  
Peak Aged ◽  
First Time

It is known that Al-Mg-Ge alloys show a similar precipitation sequence to that of Al-Mg-Si alloys, and that ther equilibrium phase is β-Mg2Ge according to the phase diagram. In this study, the precipitation sequence and age-hardening behavior of Al-1.0mass%Mg2Ge alloys has been investigated by hardness test, write out in full first time used TEM and HRTEM observations on.The hardness curves showed no big difference between peak values hardness for samples aged at 423, 473 and 523K. The precipitates in the peak-aged samples have been classified as some metastable phases, such as the β’-phase and parallelogram-type precipitates by HRTEM observation. The large precipitates are similar to the A-type precipitate in the Al-Mg-Si alloy with excess Si.

scholarly journals Age hardening heat treatment behavior of as-cast Mg–Zn–Al alloys

2021 ◽  
Vol 15 (57) ◽  
pp. 350-358
Author(s):  
Hiralal S. Patil ◽  
D. C. Patel
Keyword(s):  
Heat Treatment ◽  
Magnesium Alloys ◽  
Ternary Eutectic ◽  
Al Alloys ◽  
Age Hardening ◽  
Peak Hardness ◽  
Time Intervals ◽  
Cast Alloys ◽  
Dta Studies ◽  
Hardening Heat Treatment

Magnesium alloys have generated renewed interest as a light alloys; replacing some conventional structural materials for weight reduction in applications like aerospace, automotive and electronics industries. In interior components and powertrains, cast alloys are widely used and represent more than 99% of magnesium alloys used today, whereas only a few wrought products are used. Mostly in automotive applications, Mg-engine block can noticeably reduce the weight and consequently its fuel consumption and environmental impact. Due to solid-state precipitates, these alloys are strong in nature and are produced by an age-hardening heat treatment process. In the present work the age hardening behavior of the as cast Mg–Zn–Al alloys (ZA85 alloy) in the composition of 8 wt. %Zn, 5 wt. %Al has been investigated. Through the differential thermal analysis (DTA) studies, it has been found out that dissolution temperature of ternary eutectic precipitates is present in the alloy. Based on the DTA results, the as cast samples have been solutionised at 360 °C temperature for different intervals of time. Solutionising time has been optimized from the enthalpy values of un-dissolved precipitates. The solution treated samples have been then aged at temperature of 180° C for different time intervals. From the peak hardness values, the ageing conditions have been optimized.

Cu Nanoparticle Formation: Copper Redistribution During NaCl Solution Corrosion of Al-Cu-Mg Alloys

1998 ◽  
Vol 4 (S2) ◽  
pp. 754-755
Author(s):  
R. G. Ford ◽  
R. W. Carpenter ◽  
K. Sieradzki
Keyword(s):  
Heat Treatment ◽  
Solid State ◽  
Magnesium Alloys ◽  
Prolate Spheroid ◽  
Age Hardening ◽  
Nacl Solution ◽  
Marine Corrosion ◽  
Direct Observations ◽  
The Matrix ◽  
Lower Temperature

Aluminum-copper-magnesium alloys also containing manganese and iron (commercial designation 2024) are susceptible to marine corrosion and stress corrosion cracking. Susceptibility depends on heat treatment, and is thought to involve redistribution of copper from within the microstructure onto the surface of the corroding alloy, but few direct observations of the mechanism have been made. Copper can be distributed in several ways throughout the microstructure, which complicates mechanism studies. The primary age-hardening phase is Al2CuMg (orthorhombic; a=4.01, b=9.25, c=7.15 Å) which appears as more or less large equiaxed S particles at equilibrium, and as metastable S’ plates after aging for shorter times at lower temperature (∼190°C). In addition, ubiquitous so-called “dispersoids” containing copper and manganese (prolate spheroid morphology) or iron (irregular “blocky” morphology) do not go into solution when the alloy is solid state homogenized (-495 °C) and are always present in the microstructure. All of these phases are copper-rich sources for surface redistribution relative to the matrix during corrosion.

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