High strength SiCp/Al–2Cu-1.2Mg-0.6Si composite with weak natural aging hardening

2021 ◽  
pp. 100742
Author(s):  
S.Z. Zhu ◽  
D. Wang ◽  
Y.N. Zan ◽  
B.L. Xiao ◽  
Z.Y. Ma
Keyword(s):  
Natural Aging ◽  
High Strength ◽  
Aging Hardening

Three Point Bend Performance of Solutionized, Die Quenched and Heat Treated AA7075 Beam Members

2014 ◽  
Vol 794-796 ◽  
pp. 431-436 ◽  
Author(s):  
Alexander Bardelcik ◽  
Alexandre Bouhier ◽  
Michael J. Worswick
Keyword(s):  
Mechanical Properties ◽  
Peak Load ◽  
Natural Aging ◽  
High Strength ◽  
Total Elongation ◽  
Strength Properties ◽  
Heat Treatments ◽  
Forming Process ◽  
Heat Treated ◽  
Point Bend

To overcome the low room temperature formability of AA7075-T6 aluminum sheet, without sacrificing the high strength properties of this alloy, a hat section beam member was formed and quenched within a cold die immediately after a 20 minute solutionizing treatment. Natural aging for 24 hours followed the forming process which was then followed by various heat treatments that included a typical precipitation hardening (PH) and industrial paint bake (PB) temperature-time treatment. Tensile specimens were extracted from the beams to evaluate their mechanical properties. When compared to the as-received AA7075-T6 mechanical properties, the beams heat treated with the PH, PHPB and PB treatment resulted in a 5%, 13% and 20% reduction in ultimate tensile strength respectively. A similar trend was shown for the yield strength measurements. There was little effect of the heat treatments on the total elongation, with the PH condition showing a slight improvement. A backing plate was riveted to the beams and a quasi-static 3 point bend test was conducted to evaluate the crush performance. The peak load for the PH, PHPB and PB beams was 9.2, 8.5 and 7.3 kN respectively, but the calculated energy-displacement (or energy absorption) curves were similar for the PH and PHPB parts due to a more ductile fracture behavior for the PHPB material condition.

Effect of Aging Treatment Technology on Properties of Al-Mg-Si-Cu-Zr-Er Alloy for Auto Sheets

2016 ◽  
Vol 850 ◽  
pp. 815-822 ◽  
Author(s):  
Qian Zhao ◽  
Xiao Guang Yuan ◽  
Hong Jun Huang ◽  
Peng Zhao
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Natural Aging ◽  
Performance Testing ◽  
Aging Treatment ◽  
Treatment Technology ◽  
Microstructure Observation ◽  
Β Phase ◽  
Before And After ◽  
Aging Hardening

The effect of natural aging, pre-aging and paint-bake aging technology on properties of Al-Mg-Si-Cu-Zr-Er alloy for auto sheets was investigated by performance testing, microstructure observation, and differential thermal analysis. The results showed that the natural aging alloy before and after paint-bake aging presented the double peaks feature of both the mechanical properties and hardness, the maximum value of strength and hardness appeared on the second aging peak, and the paint-bake aging softening occurred. The result of differential thermal analysis showed that, compared with the artificial aging, the precipitation of β′′ phase was delayed after the natural aging; the precipitates were mainly β′′ nuclei at the paint-bake aging, and it is difficult to achieve paint-bake aging hardening. After pre-aging and nature aging treatment, the precipitates were mainly composed of β′′ phase at the paint-bake aging, and the paint-bake aging hardening was realized. The addition of Er and Zr elements accelerated the precipitation of β′′ phase, the precipitation temperature of β′′ phase reduced and the time of the first natural aging peak and pre-aging was shortened. The parameters of pre-aging treatment of alloy sheets was solution and water quenching, and then age at 170 °C for 5 min.

High Strength and Ductility in Multi-Directional Forged Wrought Aluminum Alloys

2014 ◽  
Vol 1064 ◽  
pp. 26-31 ◽  
Author(s):  
Li Fei Pan ◽  
Lin Chen ◽  
Wei Lin Yan
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Artificial Aging ◽  
Natural Aging ◽  
High Strength ◽  
Dislocation Slip ◽  
High Ductility ◽  
Wrought Aluminum Alloys ◽  
Wrought Aluminum ◽  
Strength And Ductility

A wrought aluminum alloy 3004 was processed by multi-directional forging (MF), natural aging and artificial aging. The samples possess high strength and high ductility after processing. Grain size in samples was reduced evidently. The strength of samples was enhanced by dispersing ultrafine precipitate particles within the grains, reducing grain-size after MF and aging. The ductility was improved due to reducing the forging stress during aging. Moreover, a dispersing ultrafine precipitate particles widespread within the grains after aging, which helps to accumulate dislocations, increase the dislocation storage capability and resist dislocation slip that lead up to increasing work hardening, the ductility was also enhanced. The tensile strength and ductility of the alloy are 422.4 MPa and 11.95%, respectively.

ALUMINUM D612

Alloy Digest ◽  
1966 ◽  
Vol 15 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Natural Aging ◽  
High Strength ◽  
Heat Treating ◽  
Good Corrosion Resistance ◽  
High Shock ◽  
Aging Alloy ◽  
Shock Resistance

Abstract Aluminum D612 is a high strength natural aging alloy having high shock resistance and good corrosion resistance for pressure tight castings. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on casting, heat treating, machining, and joining. Filing Code: Al-160. Producer or source: Reynolds Metals Company.

TITANITE

Alloy Digest ◽  
1961 ◽  
Vol 10 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Natural Aging ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Aluminum Casting ◽  
Aluminum Casting Alloy ◽  
Heat Treated ◽  
Aging Alloy ◽  
Aluminum Smelting

Abstract Titanite is a high-strength aluminum casting alloy that compares in properties with heat-treated castings. It is a natural aging alloy. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-99. Producer or source: Aluminum Smelting and Refining Company Inc..

Aging Precipitation Behavior of Cu-Ag-Cr Alloy

2006 ◽  
Vol 118 ◽  
pp. 41-46 ◽  
Author(s):  
Jing Guo Lei ◽  
Ping Liu ◽  
Bao Hong Tian ◽  
Xiao Zhi ◽  
Xiao Tian Jing
Keyword(s):  
Cold Deformation ◽  
High Strength ◽  
Intermediate Stage ◽  
Precipitation Behavior ◽  
Annealing Temperatures ◽  
Aging Precipitation ◽  
Coarsening Behavior ◽  
High Annealing ◽  
Effects Of Aging ◽  
Aging Hardening

The Cu-Ag-Cr alloy is a kind of aging hardening copper alloy and has excellent combination properties of high strength and good electrical and thermal conductivity. In the present investigation, the aging precipitation behavior of Cu-Ag-Cr alloy is studied, and the effects of aging processes on the microstructure and properties are discussed. Emphasis is on the correlation between the coherency and coarsening behavior of the Cr precipitates. When the alloy aging at low annealing temperatures, the homogeneous dispersed Cr precipitates are observed to be approximately spherical and keep coherent with Cu matrix in the Cu-Ag-Cr alloy, the coherency is lost between at 450°C~520°C, coherency on coarsening process of Cr precipitates at high annealing temperatures, the radium for coherent / semi-coherent transition of the Cr precipitates is determined from TEM micrographs as 15-45nm. Aging in the intermediate stage, coherent and semi-coherent particles can co-exist(15<r<45nm). The precipitation can be accelerated by cold deformation before aging, the 60% deformed Cu-Ag-Cr alloy aging at 480°C for 1h, the hardness and electrical conductivity can respectively reach to 158HV and 85%IACS.

scholarly journals Influence of Preaging Treatment on Bake-Hardening Response and Electrochemical Corrosion Behavior of High Strength Al-Zn-Mg-Cu-Zr Alloy

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 895 ◽  
Author(s):  
Hui Li ◽  
Xiao-Teng Liu ◽  
Jia-Yi Wang
Keyword(s):  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
Solution Treatment ◽  
Natural Aging ◽  
Electrochemical Corrosion ◽  
High Strength ◽  
Optical Microscope ◽  
Bake Hardening ◽  
Na Effect

The influence of preaging (PA) treatments on the bake hardening (BH) response of a AlZnMgCuZr aluminum alloy which served as automotive body structures were studied in this paper. A novel two-step PA treatment was particularly designed and further employed. The mechanical properties of the alloy were tested in detail. The microstructure was characterized by optical microscope (OM), transmission electron microscopy (TEM) and 3D measuring laser microscope (3D–MLM). Meanwhile, the corrosion behavior was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The results indicated that the PA treatment was beneficial for the improvement of BH response after baking at 180 °C immediately after the solution treatment and the micro-hardness reached the peak value (194 HV) after 10 h holding, which had a percentage improvement of 110.87% compared to the hardness under the solution condition. The PA treatments decreased natural aging (NA) adverse effects, while it had the lowest NA effect and optimal BH response under 120 °C/20 min. Such a novel two-step PA treatment was revealed further to decrease the NA effect and increase the BH response compared to the optimal PA treatment, in particular, the BH value could reach 168 MPa and was 21.7% higher than that of optimal PA + NA treatment. The optimal corrosion resistance has been shown up by the combined characterizations of potentiodynamic polarization curves, EIS Nyquist plots, and 3D–MLM images.

FRONTIER 40E

Alloy Digest ◽  
1952 ◽  
Vol 1 (2) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Natural Aging ◽  
High Strength ◽  
Heat Treating ◽  
High Yield ◽  
High Yield Strength ◽  
Temperature Performance ◽  
High Shock ◽  
Shock Resistance

Abstract Frontier 40-E aluminum alloy is a high strength natural aging aluminum-zinc-magnesium-chromium-titanium alloy. It requires no heat treatment to develop high strength, has high shock resistance, exceptional corrosion resistance, high yield strength, excellent machinability, and pressure tightness. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-2. Producer or source: Frontier Bronze Corporation.

Testing Natural Aging Effect on Properties of 6066 & 6063 Alloys Using Vickers Hardness and Positron Annihilation Lifetime Techniques

2010 ◽  
Vol 303-304 ◽  
pp. 107-112
Author(s):  
M.A. Abdel-Rahman ◽  
Alaa Aldeen Ahmed ◽  
Emad A. Badawi
Keyword(s):  
Positron Annihilation ◽  
Vickers Hardness ◽  
Natural Aging ◽  
High Strength ◽  
Aging Effect ◽  
Hardness Measurement ◽  
Solution Temperature ◽  
Positron Annihilation Lifetime ◽  
Solid Diffusion ◽  
Maximum Value

The aim of this work was to produce a high strength 6xxx series Aluminum alloy by adjusting the processing conditions, namely solutionizing and natural aging. It consists of heating the alloy to a temperature at which the soluble constituents will form a homogeneous mass by solid diffusion, holding the mass at that temperature until diffusion takes place, then quenching the alloy rapidly to retain the homogeneous condition. In the quenched condition, heat-treated alloys are supersaturated solid solutions that are comparatively soft and workable, and unstable, depending on composition. At room temperature, the alloying constituents of some alloys tend to precipitate from the solution spontaneously, causing the metal to harden in about four days. This is called natural aging. The mechanical characterization of heat treatable 6xxx (Al-Mg-Si-Cu based) 6066, 6063 wrought aluminum alloys was studied. Their effects were investigated in terms of microstructure using positron annihilation lifetime technique and mechanical properties by hardness measurements. The hardness is the Resistance of material to plastic deformation, which gives it the ability to resist deformed when a load is applied. The greater the hardness of the material, the greater resistance it has to deformation. Hardness measurement can be defined as macro-, micro- or nano- scale according to the forces applied and displacements obtained. Micro hardness is the hardness of a material as determined by forcing an indenter such as a Vickers indenter into the surface of the material under 15 to 1000 gf load; usually, the indentations are so small that they must be measured with a microscope. During this work we are monitoring the effect of natural aging on the properties of positron lifetime and Vickers hardness parameters. The Vickers hardness of 6066 alloy has a maximum value(80) after (10)days of quenching at 530 which is the solution temperature of this alloy .the hardness of 6063 alloy has a maximum value (40) after (14)days of quenching at 520 which is the solution temperature of this alloy. The hardness which is conformed to the references.

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