Effects of Solid Solution Treatments on Microstructures and Tensile Properties of a Mg-Y-Zn-Cu Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 449-456 ◽  
Author(s):  
Bing Qing Shi ◽  
Rong Shi Chen ◽  
Wei Ke
Keyword(s):  
Solid Solution ◽  
Tensile Testing ◽  
Solidification Process ◽  
Casting Method ◽  
Lpso Phase ◽  
Cu Alloy ◽  
Fraction Increase ◽  
Two Temperatures ◽  
Total Fraction ◽  
Property Changes

In this study, a Mg-2.1Y-0.5Zn-0.6Cu-0.1Zr (WZC200, in at. %) alloy was prepared by permanent casting method. On the basis of thermal analysis results during solidification process, two temperatures (T1/763K and T2/773K) were selected for subsequent solid solution treatments. Microstructure evolution and the tensile property changes after T4 treatment at T1 and T2 for different holding time were also investigated in this study. The tensile testing results showed that yield strength and ultimate tensile strength were improved with the fraction increase of the lamellae-shaped LPSO phase in the grain interiors, rather than the total fraction of LPSO phase.

scholarly journals Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 708
Author(s):  
Li Zhou ◽  
Yajun Luo ◽  
Zhenlin Zhang ◽  
Min He ◽  
Yinao Xu ◽  
...  
Keyword(s):  
Mold Wall ◽  
Direct Chill ◽  
Element Distribution ◽  
Direct Chill Casting ◽  
Electromagnetic Stirring ◽  
Alloying Elements ◽  
Alloying Element ◽  
Casting Method ◽  
Chill Casting ◽  
Cu Alloy

In this study, large-sized Al–Zn–Mg–Cu alloy billets were prepared by direct chill casting imposed with annular electromagnetic stirring and intercooling; a process named uniform direct chill casting. The effects of uniform direct chill casting on grain size and the alloying element distribution of the billets were investigated and compared with those of the normal direct chill casting method. The results show that the microstructures were refined and the homogeneity of the alloying elements distribution was greatly improved by imposing the annular electromagnetic stirring and intercooling. In uniform direct chill casting, explosive nucleation can be triggered, originating from the mold wall and dendrite fragments for grain refinement. The effects of electromagnetic stirring on macrosegregation are discussed with consideration of the centrifugal force that drives the movement of melt from the central part towards the upper-periphery part, which could suppress the macrosegregation of alloying elements. The refined grain can reduce the permeability of the melt in the mushy zone that can restrain macrosegregation.

scholarly journals A Study on the Damping Capacities of Mg–Zn–Y-Based Alloys with Lamellar Long Period Stacking Ordered Phases by Preparation Process

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 79
Author(s):  
Ruopeng Lu ◽  
Kai Jiao ◽  
Yuhong Zhao ◽  
Kun Li ◽  
Keyu Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Damping Capacity ◽  
Second Phase ◽  
Preparation Process ◽  
Obvious Effect ◽  
Lpso Phase ◽  
Long Period ◽  
Lamellar Phases ◽  
Ordered Phases

Mg alloys with fine mechanical properties and high damping capacities are essential in engineering applications. In this work, Mg–Zn–Y based alloys with lamellar long period stacking ordered (LPSO) phases were obtained by different processes. The results show that a more lamellar second phase can be obtained in the samples with more solid solution atoms. The density of the lamellar LPSO phase has an obvious effect on the damping of the magnesium alloy. The compact LPSO phase is not conducive to dislocation damping, but sparse lamellar phases can improve the damping capacity without significantly reducing the mechanical properties. The Mg95.3Zn2Y2.7 alloy with lamellar LPSO phases and ~100 μm grain size exhibited a fine damping property of 0.110 at ε = 10–3.

scholarly journals Solidification Process and Volume Fraction in Sn-Ag-Cu Alloy

2010 ◽  
Vol 13 (7) ◽  
pp. 521-530 ◽  
Author(s):  
Yoshiko Takamatsu ◽  
Hisao Esaka ◽  
Kei Shinozuka
Keyword(s):  
Volume Fraction ◽  
Solidification Process ◽  
Cu Alloy

Numerical Simulation of Solidification Process for Impeller Investment Casting

2011 ◽  
Vol 80-81 ◽  
pp. 961-964
Author(s):  
Jie Zhang ◽  
Kang Wen Li ◽  
Hai Wei Ye ◽  
Dong Qi Zhang ◽  
Peng Wei Wu
Keyword(s):  
Numerical Simulation ◽  
Effective Stress ◽  
Investment Casting ◽  
Strong Influence ◽  
Initial Temperature ◽  
Solidification Process ◽  
Uniform Thickness ◽  
Casting Method ◽  
Pouring Temperature

Investment casting method can fabricate the impeller slots with non-uniform thickness and distorted surface. The process of investment casting can be simulated by employing ProCAST software. The mesh of the casting was introduced in the article. The influence about the initial temperature of shell on the defects of the casting and the pouring temperature and the pouring speed on the effective stress of the casting was studied in this article. When the initial temperature of shell was 400°C,there was no defect in the casting. The pouring temperature of the casting, will produce a very strong influence on the effective stress. When the pouring temperature in this article was 800°C, the maximum effective stress of the casting was 108MPa.

Investigating the Relationships Between Structures and Properties of Al Alloys Incorporated With Ti and Mg Inclusions

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Halil Ibrahim Kurt ◽  
Ibrahim H. Guzelbey ◽  
Serdar Salman ◽  
Razamzan Asmatulu ◽  
Mustafa Dere
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
Elevated Temperatures ◽  
Solidification Process ◽  
Optical Microscope ◽  
Industrial Applications ◽  
Al Alloys ◽  
Average Grain Size ◽  
Solidification Processes ◽  
Grain Size And Shape

This study investigates the influence of titanium (Ti) and magnesium (Mg) additions on aluminum (Al) alloys in order to evaluate the relationship between the structure and properties of the new alloys. The alloys obtained at elevated temperatures mainly consist of Al–2Mg–1Ti, Al–2Mg–3Ti, Al–4Mg–2Ti, and Al–6Mg–2Ti alloys, as well as α and τ solid solution phases of intermetallic structures. Microstructural analyses were performed using X-ray diffraction (XRD), optical microscope, and energy dispersive spectrometry (EDS) techniques. Test results show that the average grain size of the alloys decreased with the addition of Ti inclusions during the casting and solidification processes, and the smallest grain size was found to be 90 μm for the Al–6Mg–3Ti alloy. In addition, tensile properties of the Al–Mg–Ti alloys were initially improved and then worsened after the addition of higher concentrations of Ti. The highest tensile and hardness values of the alloys were Al–4Mg–2Ti (205 MPa) and Al–6Mg–3Ti (80 BHN). The primary reasons for having higher mechanical properties may be attributed to strengthening of the solid solution and refinement of the grain size and shape during the solidification process. For this study, the optimum concentrations of Ti and Mg added to the Al alloys were 4 and 2 wt.%, respectively. This study may be useful for field researchers to develop new classes of Al alloys for various industrial applications.

Non-equilibrium solid solution and nanocrystal structure of Fe–Cu alloy after plastic deformation under pressure

1993 ◽  
Vol 68 (6) ◽  
pp. 877-881 ◽  
Author(s):  
V. A. Teplov ◽  
V. P. Pilugin ◽  
V. S. Gaviko ◽  
E. G. Chernyshov
Keyword(s):  
Solid Solution ◽  
Plastic Deformation ◽  
Cu Alloy ◽  
Non Equilibrium

Structure-Property Relationship in a Haynes® 242TM Alloy Subjected to Long-Term Exposure at 650°C

2012 ◽  
Vol 186 ◽  
pp. 156-159 ◽  
Author(s):  
Elżbieta Stępniowska ◽  
Stanisław Dymek
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Testing ◽  
Nominal Composition ◽  
Structure Property ◽  
Strengthening Phase ◽  
Nickel Based Superalloy ◽  
Structure Property Relationship ◽  
New Phase

This paper characterizes the microstructure and mechanical properties of the nickel-based superalloy with the nominal composition Ni–25Mo–8Cr (wt.%) after long-term annealing (4000, 6000 and 8000 h) at 650°C. The microstructure was characterized by TEM and SEM. Mechanical properties were measured trough tensile testing. The microstructure, composed initially of a dispersive Ni2(Mo,Cr) strengthening phase in a Ni-based solid solution, decomposed during annealing into a mixture of intermetallic (Ni3Mo- and Ni4Mo-type) phases and recrystallized Mo-lean Ni-based solid solution. The dominant new phase was a plate-shaped Ni3Mo-type phase. Regions adjacent to the plates of the Ni3Mo phase are recrystallized and free from the Ni2(Mo,Cr) strengthening phase.

Effect of oil palm ash on the mechanical and thermal properties of unsaturated polyester composites

e-Polymers ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 323-329 ◽  
Author(s):  
J. Sahari ◽  
M.A. Maleque
Keyword(s):  
Thermal Properties ◽  
Oil Palm ◽  
Tensile Testing ◽  
Unsaturated Polyester ◽  
Morphological Characterization ◽  
Mechanical And Thermal Properties ◽  
Casting Method ◽  
Oil Palm Ash ◽  
Polyester Composites

AbstractThis research was carried out to evaluate the effect of oil palm ash (OPA) on the mechanical and thermal properties of biocomposites. Different compositions of OPA (i.e. 0, 10, 20 and 30 vol%) were introduced to unsaturated polyester (UPE) by using simple casting method with methyl ethyl ketone peroxide (MEKP) as a hardener. The specimens were prepared based on ASTM D5083 standards for tensile testing. From the results, it was found that the mechanical properties of UPE/OPA composites were improved in modulus with increasing the OPA content. The physical properties of UPE/OPA were also investigated where the density of biocomposites decrease with increasing OPA while the water absorption of UPE/OPA increase with increasing OPA. The thermal and morphological characterization of the UPE/OPA composites have been done using TGA, DSC and SEM.

Microstructure and Mechanical Properties of Mg-9Gd-4Y-0.5Zr Alloy

2017 ◽  
Vol 904 ◽  
pp. 15-18
Author(s):  
Bo Bo Meng ◽  
Quan An Li ◽  
Xiao Ya Chen
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Tensile Testing ◽  
Treatment Process ◽  
Testing Machine ◽  
Elongation Rate ◽  
Heat Treatment Process ◽  
Tensile Testing Machine ◽  
Microstructure And Mechanical Properties

The effects of heat treatment on microstructure and mechanical properties of Mg-9Gd-4Y-0.5Zr alloy were studied by XRD, OM, SEM and tensile testing machine. The results show that the alloy mainly consists of α-Mg matrix, Mg5Gd and Mg24Y5. Through solid solution and aging heat treatment process, the tensile strength, yield strength and elongation rate respectively achieves 263.1MPa, 235.2MPa and 3.11%.

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