scholarly journals Ultrahigh specific strength in a magnesium alloy strengthened by spinodal decomposition

2021 ◽  
Vol 7 (23) ◽  
pp. eabf3039
Author(s):  
Tongzheng Xin ◽  
Yuhong Zhao ◽  
Reza Mahjoub ◽  
Jiaxi Jiang ◽  
Apurv Yadav ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Yield Strength ◽  
Spinodal Decomposition ◽  
Lattice Mismatch ◽  
High Strength ◽  
Specific Yield ◽  
Specific Strength ◽  
Dislocation Pinning ◽  
Solute Atoms ◽  
Engineering Alloys

Strengthening of magnesium (Mg) is known to occur through dislocation accumulation, grain refinement, deformation twinning, and texture control or dislocation pinning by solute atoms or nano-sized precipitates. These modes generate yield strengths comparable to other engineering alloys such as certain grades of aluminum but below that of high-strength aluminum and titanium alloys and steels. Here, we report a spinodal strengthened ultralightweight Mg alloy with specific yield strengths surpassing almost every other engineering alloy. We provide compelling morphological, chemical, structural, and thermodynamic evidence for the spinodal decomposition and show that the lattice mismatch at the diffuse transition region between the spinodal zones and matrix is the dominating factor for enhancing yield strength in this class of alloy.

Texture and Mechanical Properties of AZ31 Magnesium Alloy Sheets Processed by Symmetric/Asymmetric Combination Hot-Rolling

2010 ◽  
Vol 654-656 ◽  
pp. 719-722 ◽  
Author(s):  
J. Horiuchi ◽  
Hirofumi Inoue ◽  
Takayuki Takasugi
Keyword(s):  
Magnesium Alloy ◽  
Yield Strength ◽  
Hot Rolling ◽  
High Strength ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
High Yield ◽  
Rolled Sheet ◽  
Asymmetric Rolling ◽  
Double Peaks

Conventional symmetric rolling enhances yield strength by forming basal texture, while asymmetric rolling can improve formability by inclining the c-axis of hcp crystal. In this study, the combination rolling consisting of symmetric and asymmetric hot rolling has been performed to simultaneously improve formability and maintain high strength of AZ31 magnesium alloy sheet. The symmetrically/asymmetrically combination hot-rolled and annealed sheet exhibits a broadened texture having double peaks with tilt angles of 0º and 40º from ND toward RD with respect to the c-axis. Correspondingly, this sheet shows relatively high yield strength of 123 MPa and large elongation of 24.7%. As for cup drawing test, the conventional warm-rolled sheet is barely formed at 175 °C, but the symmetrically/asymmetrically combination rolled sheet can be formed at temperature as low as 75 °C. These results indicate that the symmetric/asymmetric combination hot-rolling leads to a unique texture with good balance of formability and strength.

scholarly journals Mechanical Properties and Microstructure of the Magnesium Alloy Mg-6.8Y-2.5Zn-0.5Al Produced by Casting and Hot Rolling

2018 ◽  
Vol 918 ◽  
pp. 3-12 ◽  
Author(s):  
Kristina Neh ◽  
Madlen Ullmann ◽  
Rudolf Kawalla
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Hot Rolling ◽  
High Strength ◽  
Final Thickness ◽  
Good Thermal Stability ◽  
Specific Strength ◽  
Automotive Electronic ◽  
Rolling Temperatures

In recent years, magnesium alloys have been received much attention as important structural materials for lightweight components in automotive, electronic and space industries because of the low density, high specific strength, high damping capacities and good casting properties. Among various magnesium alloys, rare earth (RE) containing alloys are known to show high strength, excellent creep resistance, and good thermal stability. Long period stacking ordered structures (LPSO) being responsible for the improved property profile in some Mg–RE alloys. One promising system are the Mg-Y-Zn alloys, which are predominantly processed via extrusion. Only a few studies are focused on hot rolling. However, these works are confined to rolling temperatures between 350 °C and 420 °C. The present paper summarizes the development of a rolling technique including pass schedule and heat treatment for the magnesium alloy Mg-6.8Y-2.5Zn-0.5Al in as-cast condition in order to produce sheets with a final thickness of 2.5 mm. The investigations are accompanied by the characterization of the microstructure as well as the determination of the mechanical properties.

A new high-strength spinodal alloy

2005 ◽  
Vol 20 (4) ◽  
pp. 791-795 ◽  
Author(s):  
James A. Hanna ◽  
Ian Baker ◽  
Markus W. Wittmann ◽  
Paul R. Munroe
Keyword(s):  
Yield Strength ◽  
Spinodal Decomposition ◽  
Cast Alloy ◽  
High Strength ◽  
Lattice Parameter ◽  
Body Centered Cubic ◽  
Two Phase ◽  
Annealed Material ◽  
Strength Alloy

Preliminary investigations of a new high-strength alloy of composition Fe30Ni20Mn25Al25 (at.%) are described in this paper. The as-cast alloy consisted of a periodic two-phase microstructure of interconnected, ∼50-nm-wide rods with fully coherent {100} interfaces, strongly suggestive of formation by a B2 to [(B2 + body-centered cubic (bcc)] spinodal decomposition. The (Ni,Al)-rich B2 and (Fe,Mn)-rich bcc phases differed in lattice parameter by <0.5%. Hardness and yield strength of the as-cast alloy were found to be approximately 500 VPN and 1500 MPa, respectively, and increased by more than 50% after annealing at 550 °C for several days. (Fe,Mn)-rich precipitates with a β–Mn structure were observed in the annealed material.

The Study of Electrochemical Property of Organic Coating on Magnesium Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 433-436
Author(s):  
Bai Yang Lou ◽  
Yao Tang ◽  
Ke Zai Miao ◽  
Bin Xu
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Base Alloy ◽  
High Strength ◽  
Corrosion Current ◽  
Organic Coating ◽  
Open Circuit ◽  
Corrosion Property ◽  
Organic Coatings ◽  
Specific Strength

Magnesium Alloys are of low density, high specific strength and high strength, leading to much application prospect in industry and civilian use. However, the alloys are restrictedly used because of easy corrosion. In this paper, The Organic coatings on Magnesium Alloys are made. The electrochemical properties of organic coatings are researched by scanning electron microscope (SEM), stereoscopic microscope and electric-chemistry Work station. The research results show that the curves of open-circuit current to time and Tafel polarization shuffle more for the Pu and ER/PU coatings than for base alloy. With addition of the coating, the magnesium alloy has much low corrosion current density (icorr) and high polarization resistance (Rp), and then its Anti-corrosion Property is evidently improved.

Novel hexagonal structure and ultrahigh strength of magnesium solid solution in the Mg–Zn–Y system

2001 ◽  
Vol 16 (7) ◽  
pp. 1894-1900 ◽  
Author(s):  
Akihisa Inoue ◽  
Yoshihito Kawamura ◽  
Mitsuhide Matsushita ◽  
Kentaro Hayashi ◽  
Junichi Koike
Keyword(s):  
Solid Solution ◽  
Yield Strength ◽  
High Strain ◽  
High Strength ◽  
Hexagonal Structure ◽  
Tensile Yield Strength ◽  
Specific Yield ◽  
The Novel ◽  
Fine Grain ◽  
Novel Structure

A magnesium (Mg) solid solution with a long periodic hexagonal structure was found in a Mg97Zn1Y2 (at.%) alloy in a bulk form prepared by warm extrusion of atomized powders at 573 K. The novel structure has an ABACAB-type six layered packing with lattice parameters of a = 0.322 nm and c = 3 × 0.521 nm. The Mg solid solution has fine grain sizes of 100 to 150 nm and contains 0.78 at.% Zn and 1.82 at.% Y. In addition, cubic Mg24Y5 particles with a size of about 7 nm are dispersed at small volume fractions of less than 10% in the Mg matrix. The specific density (ρ) of the extruded bulk Mg–Zn–Y alloy was 1.84 Mg/m3. The tensile yield strength (σy) and elongation (δ) are 610 MPa and 5%, respectively, at room temperature, and the specific yield strength defined by the ratio of σy to ρ is as high as 3.3 × 105 Nm/kg. High σy values exceeding 400 MPa are also maintained at temperatures up to 473 K. It is noticed that the σy levels are 2.5 to 5 times higher than those for conventional high-strength type Mg-based alloys. The Mg-based alloy also exhibits a high-strain-rate superplasticity with large δ of 700 to 800% at high strain rates of 0.1 to 0.2 s−1 and 623 K. The excellent mechanical properties are due to the combination of the fine grain size, new long periodic hexagonal solid solution containing Y and Zn, and dispersion of fine Mg24Y5 particles. The new Mg-based alloy is expected to be used in many fields.

COMPARATIVE CHARACTERISTICS OF PHYSICAL AND MECHANICAL PROPERTIES OF COMPOSITE MATERIALS AND HIGH-STRENGTH STEEL 30FGSN2A

2020 ◽  
Author(s):  
I.R. Antypes ◽  
◽  
V.V. Zaitsev ◽  
Keyword(s):  
Composite Materials ◽  
High Strength Steel ◽  
Critical Stress ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Aviation Industry ◽  
Specific Strength ◽  
Aircraft Landing ◽  
Carbon Plastics ◽  
Aircraft Landing Gear

Currently, the use of composite materials is increasingly used in various areas of the national economy, including the aviation industry. The materials of this article are devoted to the study of the use of composite materials for the manufacture of aircraft landing gear in comparison with the traditionally used brand of steel. As a result of the work carried out, it was found that the slope made of carbon fiber showed a critical stress twice as high as its design made of 30xgsn2a steel. In addition, carbon plastics are superior to high-strength steel in terms of specific strength, stiffness, and tensile strength.

DOGAL LAD

Alloy Digest ◽  
2011 ◽  
Vol 60 (10) ◽  
Keyword(s):  
Yield Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Minimum Yield

Abstract Dogal 300 LAD, 340 LAD, 380 LAD, 420 LAD, 460 LAD and 500 LAD are high-strength low alloyed steels intended for pressing. The designation in the name is the guaranteed minimum yield strength. Dogal steels can be zinc coated. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on surface qualities as well as forming, heat treating, joining, and surface treatment. Filing Code: CS-167. Producer or source: SSAB Swedish Steel Inc..

ELEKTRON EQ2

Alloy Digest ◽  
2015 ◽  
Vol 64 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
High Temperature ◽  
Magnesium Alloy ◽  
North America ◽  
Earth Element ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Temperature Performance

Abstract Elektron EQ21 is a casting high strength magnesium alloy developed as a heat treatable alloy with rare earth element additions. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive, shear, and bend strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, joining, and surface treatment. Filing Code: Mg-80. Producer or source: Magnesium Elektron Wrought Products, North America.

MAGNESIUM MSR-B

Alloy Digest ◽  
1967 ◽  
Vol 16 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Abstract Magnesium MSR-B is a heat-treatable magnesium alloy with highest yield strength of any cast magnesium alloy up to 480 F. It is pressure tight and weldable by argon-arc. It is recommended for aircraft nose wheels, missile components, transmission cases, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Mg-63. Producer or source: Magnesium Elektron Ltd.

MAGNESIUM MSR-A

Alloy Digest ◽  
1962 ◽  
Vol 11 (7) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Physical Properties ◽  
Heat Treating ◽  
Temperature Performance ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

Abstract Magnesium MSR-A is a heat-treatable magnesium alloy with highest yield strength of any cast magnesium alloy up to 480 F. It is pressure tight and weldable by argon-arc. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, and joining. Filing Code: Mg-52. Producer or source: J. Stone & Company Ltd.

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