scholarly journals Влияние скорости деформации на тепловыделение при квазистатическом растяжении металлов. Эксперимент

2018 ◽  
Vol 60 (4) ◽  
pp. 754
Author(s):  
Б.А. Зимин ◽  
В.Е. Свентицкая ◽  
И.В. Смирнов ◽  
Ю.В. Судьенков
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Energy Dissipation ◽  
Heat Release ◽  
Room Temperature ◽  
Experimental Studies ◽  
Structural Transformations ◽  
Strain Rates ◽  
Static Stretching ◽  
Qualitative Level

AbstractThe paper presents the results of experimental studies of energy dissipation during a quasi-static stretching of metals and alloys at room temperature. The strain rates varied in the range of 10^–3–10^–2 s^–1. Samples of M1 copper, AZ31B magnesium alloy, BT6 titanium, 12Cr18Ni10Ti steel, and D16AM aluminum alloy were analyzed. The experimental results demonstrated a significant dependence of the heat release on the strain rate in the absence of its influence on stress–strain diagrams for all the metals studied in this range of strain rates. The correlation of the changes in the character of heat release with the processes of structural transformations at various stages of plastic flow is shown on the qualitative level. A difference in the nature of the processes of heat release in materials with different ratios of the plasticity and strength is noted.

Newly Developed Heat Resistant Magnesium Alloy by Thixomolding®

2005 ◽  
Vol 488-489 ◽  
pp. 287-290 ◽  
Author(s):  
Tadayoshi Tsukeda ◽  
Ken Saito ◽  
Mayumi Suzuki ◽  
Junichi Koike ◽  
Kouichi Maruyama
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Die Casting ◽  
The Other ◽  
Heat Resistant ◽  
Higher Temperature ◽  
Better Than

We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of the other alloys. Creep resistance of AXEJ6310 was larger than that of AE42 by almost 3 orders and smaller than that of ADC12 by almost 2 orders of magnitude. Fatigue limits at room temperature and 423K of AXEJ6310 was superior among conventional magnesium alloys.

Superplasticity in Friction Stir Processed AZ80 Magnesium Alloy

2010 ◽  
Vol 433 ◽  
pp. 241-246 ◽  
Author(s):  
Yoshimasa Takayama ◽  
Itsuki Takeda ◽  
Toshiya Shibayanagi ◽  
Hajime Kato ◽  
Kunio Funami
Keyword(s):  
Magnesium Alloy ◽  
Cross Section ◽  
Room Temperature ◽  
Maximum Stress ◽  
Strain Rates ◽  
Friction Stir ◽  
Az80 Magnesium Alloy ◽  
Lower Strain ◽  
Elongation To Failure ◽  
Scanning Electron

Superplasticity in an AZ80 magnesium alloy subjected to friction stir processing (FSP) has been investigated. FSP was carried out at two traveling speeds of 150mm/min and 300mm/min for grain refinement. Optical microscopy on cross section to processing direction revealed obvious differences in size and feature between the stir zones at the two traveling speeds. The hardness of FSPed sample at the room temperature was about 30HV higher than that of as-received one. The maximum stress of the FSPed sample was reduced remarkably at lower strain rates compared with those of the as-received one at 573K and 673K. On the other hand, the elongation to failure of the FSPed sample showed ten to thirteen times larger than that of the as-received one at 573K and low strain rates. Further surface morphology near the fracture tip was observed by scanning electron microscopy to discuss deformation mechanism at high temperatures.

Mechanical Properties and Microstructure of AZ31 Magnesium Alloy under Uni-Axial Tensile Loading

2011 ◽  
Vol 686 ◽  
pp. 219-224 ◽  
Author(s):  
Xiao Yu Zhong ◽  
Guang Jie Huang ◽  
Fang Fang He ◽  
Qing Liu
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Strain Rates ◽  
Axial Tensile ◽  
Magnesium Alloy Az31b ◽  
Plastic Deformation Behavior ◽  
Electron Back Scattered Diffraction

Uni-axial tensile plastic deformation behavior of rolled magnesium alloy AZ31B under the temperature range from room temperature(RT) to 250°C with strain rates between 10-3 and 10-1s-1 has been systematically investigated. Microstructure evolution and texture were determined using optical microscopy (OM) and electron back-scattered diffraction (EBSD) techniques, respectively. Our results indicated that the strength and elongation-to-fracture were more sensitive to strain rates at elevated temperature rather than that at room temperature; dynamic recrystallization (DRX) and relaxation of stress at elevated temperature resulted in dramatic change of mechanical properties. Compared with strain rate, the temperature played a more important role in ductility of AZ31B Mg alloy sheet.

Effect of Severe Plastic Deformation by 120 deg ECAP or Shock Impact on 6061 Aluminum Alloy at High Strain Rates

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
T. Camalet ◽  
A. Rusinek ◽  
R. Bernier ◽  
M. Karon ◽  
R. Massion ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Room Temperature ◽  
High Strain ◽  
Material Behavior ◽  
Strain Rates ◽  
Plastic Deformations ◽  
6061 Aluminum Alloy ◽  
Angular Pressing ◽  
Ecap Process ◽  
Shock Impact

The aim of this paper is to analyze the macroscopic behavior of an aluminum alloy after severe plastic deformations (SPD). Samples of 6061 aluminum alloy are processed at room temperature by two techniques of SPD: equal channel angular pressing (ECAP) under quasi-static loading and impact under dynamic loading, using Taylor's test setup. In addition to the mechanical properties, the microstructure evolution of the material is investigated. Half of the samples are aged at 400 °C for 2 h, to remove internal stress in a commercial alloy in order to increase workability of the material. The evolution of the properties and the material behavior after 2, 4, 6, and 8 passes of the 120 deg ECAP process is investigated.

Superplasticity of Ultrafine-Grained Aluminum Alloy Processed by ECAP and Warm Rolling

2007 ◽  
Vol 551-552 ◽  
pp. 13-20
Author(s):  
Rinat K. Islamgaliev ◽  
N.F. Yunusova ◽  
M.A. Bardinova ◽  
A.R. Kilmametov ◽  
Ruslan Valiev
Keyword(s):  
Aluminum Alloy ◽  
Room Temperature ◽  
High Strain ◽  
High Strength ◽  
Warm Rolling ◽  
Grain Structure ◽  
Strain Rates ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Equiaxed Grain

The ultrafine-grained (UFG) 1421 aluminum alloy processed by equal channel angular pressing (ECAP) has demonstrated enhanced superplasticity at low temperature and high strain rates. This UFG material was successfully rolled at temperatures of 330-370oC retaining small grain size and equiaxed grain structure. The microstructure of the UFG alloy subjected to warm rolling (WR) was studied, and the mechanical properties of the ECAP+WR samples with UFG structures were investigated. We have found that the rolled material exhibited not only the enhanced superplasticity, but also high strength at room temperature.

Formability Characteristics of AA5083 Sheets under Hot Forming Conditions

2013 ◽  
Vol 549 ◽  
pp. 356-363
Author(s):  
Stefania Bruschi ◽  
Andrea Ghiotti ◽  
Francesco Michieletto
Keyword(s):  
Aluminum Alloy ◽  
Elevated Temperature ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Superplastic Forming ◽  
Tensile Tests ◽  
Processing Route ◽  
Strain Rates ◽  
Fine Grained ◽  
Axial Tensile

The production of aluminum alloy components through sheet forming processes conducted at elevated temperatures is gaining more and more interest as it gives raise to the possibility of a significant enhancement of the metal formability characteristics, compared to room temperature forming. Aluminum alloy AA5083 blanks, which present a limited formability at room temperature, are usually formed through superplastic forming at elevated temperature: however, this processing route is too slow to be applicable for large batch production, typical for instance of the automotive industry. The paper is aimed at exploring the formability characteristics of the AA5083 when deformed at elevated temperature, but in a range of strain rates higher than those usually applicable in superplastic forming. To this aim, uni-axial tensile tests were carried out, in order to record the material formability characteristics as a function of temperature and strain rate, and to correlate them with the developed microstructural features. It is shown that it is possible to work at higher strain rates, still preserving a significant formability, even without using a conventional fine-grained superplastic alloy.

scholarly journals INFLUENCE OF TEMPERATURE AND DRAWING SPEED ON THE FORMING OF ALUMINUM ALLOY 1100 VIA WARMING HYDROFORMING PROCESS

2021 ◽  
Vol 16 (5) ◽  
Author(s):  
Mohammed Mishri Gatea
Keyword(s):  
Aluminum Alloy ◽  
Room Temperature ◽  
Fe Simulation ◽  
Effect Of Temperature ◽  
Strain Rates ◽  
Ansys Software ◽  
Drawing Speed ◽  
Axial Tensile ◽  
Hydroforming Process ◽  
Temperature Levels

The limiting used of the alloys of aluminum since the formability is low at room temperature. To plan and grow more parts made of aluminum, new forming systems, for example, warm framing hydroforming and warming hydroforming processes have been explored to solve the low formability. The effect of temperature on the mechanical properties of aluminum 1100 sheet alloy is investigated at different temperature levels and strain rates using the test of uni-axial tensile. A warming forming tool for sheet metal is designed and manufactured. Four temperatures levels were used in this experiments (25 , 100 200 and 300 ). The drawing speeds that were used in these experiments were (3, 6, and 9 mm/min). Before design, the warming hydro-punch system, the analysis of this system is done in ANSYS software to choose the optimum die radius and then the results of experiments are simulated. The results of experiments showed that the appropriate hydroforming temperature and drawing speed of 1100 aluminum alloy are 300 and 3mm/min respectively. The FE simulation of strain distribution matched reasonably well with the experimental results.

ALCOA ALUMINUM ALLOY 7050

Alloy Digest ◽  
1990 ◽  
Vol 39 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Stress Corrosion Cracking ◽  
Heat Treating ◽  
Thin Sections ◽  
Aerospace Applications ◽  
Temperature Performance ◽  
Aluminum Company

Abstract ALCOA ALUMINUM ALLOY 7050 is an aluminum-zinc-copper-magnesium alloy with a superior combination of strength, stress-corrosion cracking resistance and toughness, particularly in thick sections. In thin sections it also possesses an excellent combination of properties that are important for aerospace applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, and joining. Filing Code: Al-233. Producer or source: Aluminum Company of America. Originally published as Aluminum 7050, January 1979, revised January 1990.

MAGNESIUM AZ31B

Alloy Digest ◽  
1962 ◽  
Vol 11 (9) ◽  
Keyword(s):  
High Temperature ◽  
Magnesium Alloy ◽  
Physical Properties ◽  
Room Temperature ◽  
Heat Treating ◽  
General Purpose ◽  
Bearing Strength ◽  
Temperature Performance ◽  
Wrought Magnesium Alloy ◽  
Metal Products

Abstract Magnesium AZ31B is a general purpose wrought magnesium alloy for room temperature service. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive, shear, and bearing strength as well as creep. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Mg-53. Producer or source: The Dow Metal Products Company.

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