Materials and Processing Designs for High-Performance Magnesium Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 453-456
Author(s):  
Katsuyoshi Kondoh ◽  
Ritsuko Tsuzuki ◽  
Wenbo Du ◽  
Shigeharu Kamado
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Rare Earth ◽  
Solid State ◽  
Magnesium Alloys ◽  
High Performance ◽  
Plastic Working ◽  
Coarse Powder ◽  
Rare Earth Alloy ◽  
High Ultimate Tensile Strength

Materials and processing designs for advanced magnesium alloys with fine microstructures and superior properties were established by the combination of the repeated plastic working and the Mg2Si synthesis in solid-state. The grain size was less than 1 μm via RPW process due to its severe plastic working on raw powder. The hot extruded magnesium alloys produced in industries showed high ultimate tensile strength, e.g. 420~450MPa, when employing Mg-Zn-Al-Ca-RE (Rare Earth) alloy coarse powder, having 0.5~2 mm diameter, as input materials.

Mechanical Behavior and Stress-Induced Martensitic Transformation in Nanocrystalline Ti49.4Ni50.6 Alloy

2008 ◽  
Vol 584-586 ◽  
pp. 470-474 ◽  
Author(s):  
Egor Prokofiev ◽  
Dmitriy Gunderov ◽  
Alexandr Lukyanov ◽  
Vladimir Pushin ◽  
Ruslan Valiev
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Martensitic Transformation ◽  
Ultimate Tensile Strength ◽  
High Pressure Torsion ◽  
Coarse Grained ◽  
High Yield ◽  
D 20 ◽  
20 Nm ◽  
High Ultimate Tensile Strength

Amorphous-nanocrystalline Ti49.4Ni50.6 alloy in the shape of a disc 20 mm in diameter has been successfully produced using high pressure torsion (HPT). Application of HPT and annealing at temperatures of 300–550°C resulted in formation of a nanocrystalline (NC) structure with the grain size (D) about 20–300 nm. The HPT samples after annealing at Т = 400°C with the D= 20 nm possess high yield stress and high ultimate tensile strength (more than 2000 MPa). There is an area of strain-induced transformation B2-B19’ on the tensile curve of the samples with the grain size D =20 nm. The stress of martensitic transformation (σm) of samples is 450 MPa, which is three times higher than σm in the initial coarse-grained state (σm ≈ 160 MPa). The HPT samples after annealing at Т = 550°C with the D= 300 nm possess high ductility (δ>60 %) and high ultimate tensile strength (about 1000 MPa).

Annealing Characteristics of Al-Light-Rare-Earth Alloy Thin Films for Microelectronic Conductor Lines

1995 ◽  
Vol 403 ◽  
Author(s):  
Shinji Takayama ◽  
Naganori Tsutsui
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Rare Earth ◽  
Grain Boundaries ◽  
High Temperatures ◽  
Light Rare Earth ◽  
Rare Earth Alloy ◽  
Metallic Compounds ◽  
Al Matrix

AbstractThe addition of La and Pr to Al thin films markedly decreases the grain size of the Al matrix and largely suppresses growth of thermal defects of hillocks and whiskers at high temperatures (350°C – 450°C). A large number of fine metallic compounds of Al11RE3 and/or Al3RE (RE = La and Pr) were segregated in an Al matrix, mostly at grain boundaries, after annealing at 350°C. The resistivities of the films after annealing at the above temperatures show very low values of less than 6 μωcm, without the salient formation of hillocks or whiskers on the film surfaces.

Effects of Rare Earth on Microstructure and Mechanical Properties of Al-3.2Mg Alloy

2015 ◽  
Vol 817 ◽  
pp. 192-197
Author(s):  
Xin Zhang ◽  
Ze Hua Wang ◽  
Ze Hua Zhou ◽  
Jian Ming Xu ◽  
Zhao Jun Zhong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Grain Size ◽  
Tensile Strength ◽  
Rare Earth ◽  
Second Phase ◽  
Phase Precipitation ◽  
X Ray ◽  
Scanning Electron

A series of Al-3.2Mg alloys with addition of 0~1.6 wt.% rare earth (Ce and La) were prepared. The microstructure of as-cast Al-3.2Mg alloys was investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and the tensile strength was measured. The results indicated that the addition of rare earth elements refined grain size and secondary dendrite arm spacing (SDAS), and the tensile strength was affected by means of the second-phase precipitation and the grain boundary. Accordingly, the ductility of Al-3.2Mg alloys reduced with the increasing of RE addition due to the more second-phase formation.

High Performance, Light weight Thermoplastic/Rare Earth Alloy Magnets

1999 ◽  
Vol 577 ◽  
Author(s):  
Jun Xiao ◽  
Joshua U. Otaigbe
Keyword(s):  
Rare Earth ◽  
High Performance ◽  
Mechanical Performance ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Exploratory Research ◽  
Rare Earth Alloy ◽  
Crystal Polymer ◽  
High Performance Polymer

ABSTRACTWe report progress on our exploratory research on surface modification of magnetic NdFeB fillers, characterization of suitable magnetic rare earth alloy powders and high-performance polymer matrices, processability, and properties of novel thermoplastic/NdFeB magnets. The results suggest that blending liquid crystal polymer (LCP) with a high-thermoplastic polymer such as polyphenylene sulfide (PPS) provides the required balance of properties. These properties include superior magneto-mechanical performance, minimal melt viscosity at optimal NdFeB volume loading, enhanced thermal stability, high stiffness, high strength, improved dimensional stability, and excellent chemical resistance; making the thermoplastics magnets suitable for use in high temperature and aggressive environments where commercial polymer-bonded magnets are not useable.

High-performance poly(lactide) composites by construction of network-like shish-kebab crystals

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 71046-71051 ◽  
Author(s):  
Tianfeng Shen ◽  
Yunsheng Xu ◽  
Piming Ma ◽  
Likui Wang ◽  
Weifu Dong ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Solid State ◽  
Crystal Structures ◽  
High Performance ◽  
Uniaxial Stretching

Novel high-performance PLA composites were prepared by solid-state uniaxial stretching with the OXA as needle-like nucleation templates leading to a unique network-like shish-kebab crystal structures with a tensile strength above 120 MPa.

scholarly journals Microstructure Evolution and Mechanical Properties of AZ31 Magnesium Alloy Sheets Prepared by Low-Speed Extrusion with Different Temperature

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 644
Author(s):  
Wenyan Zhang ◽  
Hua Zhang ◽  
Lifei Wang ◽  
Jianfeng Fan ◽  
Xia Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Magnesium Alloys ◽  
Microstructure Evolution ◽  
Extrusion Temperature ◽  
Az31 Magnesium Alloy ◽  
Low Speed

AZ31 magnesium alloy sheets were prepared by low-speed extrusion at different temperatures, i.e., 350 °C, 400 °C, and 450 °C. The microstructure evolution and mechanical properties of extruded AZ31 magnesium alloy sheets were studied. Results indicate that the low-speed extrusion obviously improved the microstructure of magnesium alloys. As the extrusion temperature decreased, the grain size for the produced AZ31 magnesium alloy sheets decreased, and the (0001) basal texture intensity of the extruded sheets increased. The yield strength and tensile strength of the extruded sheets greatly increased as the extrusion temperature decreased. The AZ31 magnesium alloy sheet prepared by low-speed extrusion at 350 °C exhibited the finest grain size and the best mechanical properties. The average grain size, yield strength, tensile strength, and elongation of the extruded sheet prepared by low-speed extrusion at 350 °C were ~2.7 μm, ~226 MPa, ~353 MPa, and ~16.7%, respectively. These properties indicate the excellent mechanical properties of the extruded sheets prepared by low-speed extrusion. The grain refinement effect and mechanical properties of the extruded sheets produced in this work were obviously superior to those of magnesium alloys prepared using traditional extrusion or rolling methods reported in other related studies.

Effects of Mixed RE on Die-Casting Microstructures and Properties of Commercial Mg Alloy

2011 ◽  
Vol 295-297 ◽  
pp. 974-977
Author(s):  
Yao Li ◽  
Jun Jie Yang ◽  
Wu Xin Yu ◽  
Ping Xue ◽  
Zhi Jiang Zuo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Rare Earth ◽  
Die Casting ◽  
Mg Alloy ◽  
Crystal Boundary ◽  
Microstructure And Properties ◽  
Reticular Structure

In this paper, the commercial AZ91 Mg alloy with mixed rare earth (RE) Y、Gd and Nd has been investigated and effects of RE on die-casting microstructure and properties of die-casting Mg alloy has been also explored. The results indicate that RE can effectively refine the grain size of the alloy and improve inner microstructures transforming the reticular structure of Mg17Al12phrase into granular or dotlike structure. At the same time, the amount of the compound at crystal boundary is less than that in the alloy without RE. In addition, the mechanical properties of AZ91 Mg alloy with mixed RE has been improved efficiently, and its tensile strength sbcan reach over 260MPa; its elongation δ can also reach over 4.5％. When the amount of mixed RE exceeds 5%, it will form coarse Al-RE compounds, which can low the mechanical properties of Mg alloy.

Recrystallisation of Magnesium Alloys Containing Rare-Earth Elements

2013 ◽  
Vol 753 ◽  
pp. 297-300 ◽  
Author(s):  
Nicole Stanford
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Hot Rolling ◽  
Earth Element ◽  
Rare Earth Alloy ◽  
Annealing Temperatures ◽  
High Annealing ◽  
Conventional Alloy ◽  
The Rare Earth

The static recrystallisation behaviour of two magnesium alloys after hot rolling have been examined. The alloys chosen for study were the conventional alloy AZ31, and an alloy containing the rare earth element Gadolinium. The recrystallisation kinetics were lower for the rare-earth alloy at low annealing temperatures, but at high annealing temperatures the kinetics were higher for the rare-earth alloy. It is suggested that this change in the comparative recrystallisation kinetics is a result of the improved mobility of the rare-earth solute at higher temperatures. This affects the recrystallisation kinetics through solute partitioning to the grain boundaries. The effect of this segregation on the recrystallisation texture is also discussed.

Highly flexible, foldable and stretchable Ni–Co layered double hydroxide/polyaniline/bacterial cellulose electrodes for high-performance all-solid-state supercapacitors

2018 ◽  
Vol 6 (34) ◽  
pp. 16617-16626 ◽  
Author(s):  
Heng Wu ◽  
Yani Zhang ◽  
Wenyu Yuan ◽  
Yingxin Zhao ◽  
Shaohong Luo ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Solid State ◽  
Electrochemical Performance ◽  
Bacterial Cellulose ◽  
Layered Double Hydroxide ◽  
High Performance ◽  
Electrochemical Stability ◽  
High Tensile Strength ◽  
Excellent Electrochemical Performance ◽  
Double Hydroxide

NiCo-LDH/PANI/BC exhibits excellent electrochemical performance, high tensile strength and outstanding electrochemical stability during bending and stretching.

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