Effects of Zr on Microstructure and Conductivity of Er Containing Heat-Resistant Aluminum Alloy Used for Wires

2016 ◽  
Vol 852 ◽  
pp. 205-210 ◽  
Author(s):  
Yu Han ◽  
Bao An Chen ◽  
Zhi Xiang Zhu ◽  
Dong Yu Liu ◽  
Yan Qiu Xia
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Heat Resistance ◽  
Aluminium Alloy ◽  
Phase Formation ◽  
Aluminium Alloys ◽  
Thermodynamic Behavior ◽  
Heat Resistant ◽  
Different Content ◽  
Zr Alloys

It has particular heat-resistant property and conductivity of high-conductivity heat-resistant Aluminium alloys, which would be wildly applied in transmission and transformation flied. Al-Er-Zr alloys containing different content of Zr were prepared. The effect of Zr on microstructure of heat-resistance Aluminum alloy were studied by using of STEM, and thermodynamic behavior of Zr in Aluminium alloy was analyzed based on the theory of alloy phase formation. The results showed that the effect of Zr content on the grain size of heat-resistant aluminum alloy was remarkable, and the conductivity of heat-resistance Aluminum alloy was influenced.

scholarly journals Homogenisation Efficiency Assessed with Microstructure Analysis and Hardness Measurements in the EN AW 2011 Aluminium Alloy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1211
Author(s):  
Maja Vončina ◽  
Aleš Nagode ◽  
Jožef Medved ◽  
Irena Paulin ◽  
Borut Žužek ◽  
...  
Keyword(s):  
Experimental Data ◽  
Image Analysis ◽  
Phase Equilibrium ◽  
Aluminium Alloy ◽  
Phase Formation ◽  
Aluminium Alloys ◽  
Eutectic Phase ◽  
The Matrix ◽  
Equilibrium Solidification ◽  
Homogenisation Process

When extruding the casted rods from EN AW 2011 aluminium alloys, not only their homogenized structure, but also their extrudable properties were significantly influenced by the hardness of the alloy. In this study, the object of investigations was the EN AW 2011 aluminium alloy, and the effect of homogenisation time on hardness was investigated. First, homogenisation was carried out at 520 °C for different times, imitating industrial conditions. After homogenisation, the samples were analysed by hardness measurements and further characterised by microscopy and image analysis to verify the influence of homogenisation on the resulting microstructural constituents. In addition, non-equilibrium solidification was simulated using the program Thermo-Calc and phase formation during solidification was investigated. The homogenisation process enabled more rounded shape of the Al2Cu eutectic phase, equilibrium formation of the phases, and the precipitation in the matrix, leading to a significant increase in the hardness of the EN AW 2011 aluminium alloy. The experimental data revealed a suitable homogenisation time of 4–6 h at a temperature of 520 °C, enabling optimal extrusion properties.

Study on the Formability of Aluminium Alloy Sheets at Room and Elevated Temperatures

2016 ◽  
Vol 877 ◽  
pp. 393-399
Author(s):  
Jia Zhou ◽  
Jun Ping Zhang ◽  
Ming Tu Ma
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Elevated Temperature ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Elevated Temperatures ◽  
Hot Stamping ◽  
Natural Aging ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet

This paper presents the main achievements of a research project aimed at investigating the applicability of the hot stamping technology to non heat treatable aluminium alloys of the 5052 H32 and heat treatable aluminium alloys of the 6016 T4P after six months natural aging. The formability and mechanical properties of 5052 H32 and 6016 T4P aluminum alloy sheets after six months natural aging under different temperature conditions were studied, the processing characteristics and potential of the two aluminium alloy at room and elevated temperature were investigated. The results indicated that the 6016 aluminum alloy sheet exhibit better mechanical properties at room temperature. 5052 H32 aluminum alloy sheet shows better formability at elevated temperature, and it has higher potential to increase formability by raising the temperature.

scholarly journals Experimental Investigation of Dry and Cryogenic Friction Stir Welding of AA7075 Aluminium Alloy

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
A. Praveen Raj Navukkarasan ◽  
K. Shanmuga Sundaram ◽  
C. Chandrasekhara Sastry ◽  
M. A. Muthu Manickam
Keyword(s):  
Grain Size ◽  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Dry Friction ◽  
Weld Zone ◽  
Grain Structure ◽  
Temperature Differential ◽  
Friction Stir ◽  
Aa 7075

An attempt has been made to investigate dry and cryogenic friction stir welding of AA 7075 aluminium alloy, which is predominantly availed in aerospace and defence component industries. These industries avail friction stir welding for joining two nonferrous materials, and minimal deviations and maximum strength are the preliminary and long time goal. A cryogenic friction stir welding setup was developed to conduct the joining of two aluminium alloy pipes. An increase of 0.76–42.93% and 3.79–31.24% in microhardness and tensile strength, respectively, is ascertained in cryogenic friction stir welding in correlation to dry friction stir welding of aluminium alloys. TOPSIS evaluation for the experimental run indicated tool profile stepped type, pipe rotation speed of 1000 rpm, welding speed of 50 mm/min, and axial force of 8 kN as close to unity ideal solution for dry and cryogenic friction stir welding of AA 7075 aluminium alloys. The friction stir-welded component under the cryogenic environment showcased drop in temperature, curtailed surface roughness, and fine grain structure owing to reduction in temperature differential occurring at the weld zone. A curtailment of 50.84% is ascertained in the roughness value for cryogenic friction stir welding in correlation to dry friction stir welding of AA 7075 alloy. A decrement of 21.68% is observed in the grain size in the cryogenic condition with correlation to the dry FSW process, indicating a drop in the coarse structure. With the curtailment of grain size and drop in temperature differential, compressive residual factor and corrosion resistance attenuated by 40.14% and 67.17% in the cryogenic FSW process in correlation to the dry FSW process, respectively.

Research on the Properties and Processing of 6Z63 Aluminium Alloy Tubular Busbar

2014 ◽  
Vol 722 ◽  
pp. 3-8
Author(s):  
Guo Ming Yu ◽  
Hong Mei Fan
Keyword(s):  
Mechanical Properties ◽  
Heat Resistance ◽  
Aluminium Alloy ◽  
Trace Amount ◽  
Thermomechanical Processing ◽  
Chemical Components ◽  
Processing Technologies ◽  
Heat Resistant ◽  
Alloy Increase ◽  
Processing Properties

The heat resistance, ampacity and processing properties of Al-Mg-Si alloy increase significantly by Adding trace amount of Zr, Re, Cu and other elements into the metal. The mechanical properties of aluminium alloy can also be greatly improved by thermomechanical processing. The high-strenght and heat-resistant 6Z63 aluminium alloy was prepared according to the theories above. The experimental analyses is based on its chemical components, processing technologies, product properties and mechanism.

scholarly journals Z-phase Formation during Creep and Aging in 9–12% Cr Heat Resistant Steels

2006 ◽  
Vol 46 (5) ◽  
pp. 769-775 ◽  
Author(s):  
Kota Sawada ◽  
Hideaki Kushima ◽  
Kazuhiro Kimura
Keyword(s):  
Phase Formation ◽  
Heat Resistant ◽  
Heat Resistant Steels

scholarly journals A Physical-Based Plane Stress Constitutive Model for High Strength AA7075 under Hot Forming Conditions

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 314
Author(s):  
Fulong Chen ◽  
Haitao Qu ◽  
Wei Wu ◽  
Jing-Hua Zheng ◽  
Shuguang Qu ◽  
...  
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Plane Stress ◽  
Metal Forming ◽  
Electron Backscatter Diffraction ◽  
High Strength ◽  
Material Model ◽  
Hot Forming ◽  
Industrial Processing ◽  
Average Grain Size

Physicallybased constitutive equations are increasingly used for finite element simulations of metal forming processes due to the robust capability of modelling of underlying microstructure evolutions. However, one of thelimitations of current models is the lack of practical validation using real microstructure data due to the difficulties in achieving statistically meaningful data at a sufficiently large microstructure scale. Particularly, dislocation density and grain size governing the hardening in sheet deformation are of vital importance and need to be precisely quantified. In this paper, a set of dislocation mechanics-based plane stress material model is constructed for hot forming aluminum alloy. This material model is applied to high strength 7075 aluminum alloy for the prediction of the flow behaviorsconditioned at 300–400 °C with various strain rates. Additionally, an electron backscatter diffraction (EBSD) technique was applied to examine the average grain size and geometrical necessary dislocation (GND) density evolutions, enabling both macro- and micro- characteristics to be successfully predicted. In addition, to simulate the experienced plane stress states in sheet metal forming, the calibrated model is further extended to a plane stress stateto accuratelypredict the forming limits under hot conditions.The comprehensively calibrated material model could be used for guidinga better selection of industrial processing parameters and designing process windows, taking into account both the formed shape as well as post formed microstructure and, hence, properties.

scholarly journals Molecular Physiological Characterization of a High Heat Resistant Spore Forming Bacillus subtilis Food Isolate

2021 ◽  
Vol 9 (3) ◽  
pp. 667
Author(s):  
Zhiwei Tu ◽  
Peter Setlow ◽  
Stanley Brul ◽  
Gertjan Kramer
Keyword(s):  
Bacillus Subtilis ◽  
Heat Resistance ◽  
Dipicolinic Acid ◽  
Laboratory Strain ◽  
High Heat ◽  
High Heat Resistance ◽  
Vegetative Cells ◽  
Heat Resistant ◽  
Food Isolate ◽  
Wet Heat

Bacterial endospores (spores) are among the most resistant living forms on earth. Spores of Bacillus subtilis A163 show extremely high resistance to wet heat compared to spores of laboratory strains. In this study, we found that spores of B. subtilis A163 were indeed very wet heat resistant and released dipicolinic acid (DPA) very slowly during heat treatment. We also determined the proteome of vegetative cells and spores of B. subtilis A163 and the differences in these proteomes from those of the laboratory strain PY79, spores of which are much less heat resistant. This proteomic characterization identified 2011 proteins in spores and 1901 proteins in vegetative cells of B. subtilis A163. Surprisingly, spore morphogenic protein SpoVM had no homologs in B. subtilis A163. Comparing protein expression between these two strains uncovered 108 proteins that were differentially present in spores and 93 proteins differentially present in cells. In addition, five of the seven proteins on an operon in strain A163, which is thought to be primarily responsible for this strain’s spores high heat resistance, were also identified. These findings reveal proteomic differences of the two strains exhibiting different resistance to heat and form a basis for further mechanistic analysis of the high heat resistance of B. subtilis A163 spores.

Research on Springback Compensation of Aluminium Alloy Automobile Body Panel

2013 ◽  
Vol 791-793 ◽  
pp. 390-393
Author(s):  
Lei Hu ◽  
Hui Xie ◽  
Xing Xing Hu ◽  
Zhi Hong Pan ◽  
Hao Ming Jiang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Curved Surface ◽  
Practical Application ◽  
Springback Compensation ◽  
Cycle Simulation ◽  
Automobile Body ◽  
Compensation Principle ◽  
Working Procedure

The performance of the aluminum alloy makes it the most popular lightweight materials for the automobile manufacturers. However, due to the disparity on the crystal structure,it has the higher springback values compared with steel. In order to solve the problem, we put forward a new springback compensation method based on displacement compensation principle and the principle of curved surface fairing design methods. Though full cycle simulation and calculate springback value for each working procedure, then generate the springback compensation surface. The methods practical application effect is good.

Sign in / Sign up

Export Citation Format

Share Document