Machinability of A356 cast alloys under the effect of artificial aging treatment and lubrication modes

The effects of Mg and Cu additions with different contents on the mechanical properties of Al-Si alloy prepared by indirect squeeze casting have been experimentally investigated. The microstructure and mechanical properties of as-cast and T6-treated Al-Si-Cu-Mg alloys were tested by OM, SEM, DSC and tensile measurement, where the samples were produced by artificial aging at 180°C for 8 h after solution treatment at 540°C for 4 h. It has been found that for the as-cast alloys, with increasing contents of Mg and Cu the tensile strength (UTS) and yield strength (YS) increased, while the percentage elongation (El) decreased. And the optimal mechanical properties of Al-Si-Cu-Mg alloys were obtained under the content ratio of Cu/Mg within 4, where the UTS and El reached 426 MPa and 6.3% after T6 treated, respectively.

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Microstructure and mechanical properties of modified Mg–8Al–2Sn alloys using Zn addition combined with artificial aging treatment

Materials Science and Engineering A ◽

10.1016/j.msea.2021.142278 ◽

2021 ◽

pp. 142278

Author(s):

Chen-Yi Ma ◽

Xiao-Fang Guan ◽

Lu Sun ◽

Guo–Jun Liu

Keyword(s):

Mechanical Properties ◽

Artificial Aging ◽

Aging Treatment ◽

Microstructure And Mechanical Properties ◽

Zn Addition

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Effect of Artificial Aging on Microstructures and Mechanical Properties of Extruded Mg Alloy ZK60

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.697.72 ◽

2014 ◽

Vol 697 ◽

pp. 72-75

Author(s):

De Liang Yin ◽

Jian Qiao ◽

Hong Liang Cui

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

Aging Time ◽

Artificial Aging ◽

Aging Treatment ◽

Tensile Tests ◽

Tensile Yield Strength ◽

Uniaxial Tensile ◽

Fracture Elongation ◽

Strength And Ductility

An extruded ZK60 magnesium alloy was subjected to artificial aging at 180 oC for an investigation of the effect of aging time on its precipitation behavior and mechanical properties. Uniaxial tensile tests were conducted to obtain the mechanical properties. Optical microscopy and transmission electron microscopy (TEM) were employed to observe microstructure change before and after aging treatment. It is shown that, both tensile yield strength and ultimate tensile strength increases with aging time. The fracture elongation after aging for 20 h reaches up to 21.0%, and the yield strength increases to 269.5 MPa, 19.4% higher than that of extruded specimens (un-aged), showing a good match of strength and ductility. Three newly-formed precipitates were observed after aging for over 20 h, among which particulate and dispersive precipitates should be responsible for the good combination of strength and ductility.

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Fatigue Behavior Improvement of A356 Aluminum Alloy of Motorcycle Cast Wheel Produced by High Speed Centrifugal Casting Based on T6 Heat Treatment and Artificial Aging

Materials Science Forum ◽

10.4028/www.scientific.net/msf.991.86 ◽

2020 ◽

Vol 991 ◽

pp. 86-93

Author(s):

Priyo Tri Iswanto ◽

Akhyar Hasan ◽

Aditya Janata ◽

Luthfi Muhammad Mauludin ◽

Hizba Muhammad Sadida

Keyword(s):

Heat Treatment ◽

Aluminum Alloy ◽

High Speed ◽

Artificial Aging ◽

Fatigue Behavior ◽

Centrifugal Casting ◽

Aging Treatment ◽

A356 Aluminum Alloy ◽

T6 Heat Treatment ◽

A356 Aluminum

Fatigue behavior of A356 aluminum alloy for motorcycle rim was experimentally investigated based on T6 heat treatment and artificial aging. The high speed of 1,100 rpm from centrifugal casting was used in this study. The pouring temperature at 750 °C was employed and the preheated temperature at 250 °C was applied on the mold. The solution heat treatment of the sample was conducted for 4 hours at 540 o C before it immersed into the water for rapid cooling at room temperature. This step followed by natural aging treatment at 30 °C and artificial aging treatment at 150 °C, 175 °C, and 200 °C for 2 hours, respectively. It is found that increasing centrifugal casting speed into 1,100 rpm combined with heat treatment and artificial aging temperature can significantly increase not only its mechanical properties but also the fatigue life of motorcycle wheel made of A356 aluminum alloy. This experiment proved that the lowest fatigue crack growth rate obtained with this method was at temperature of 175°C.

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Thermocatalytic Degradation of Low Density Polyethylene Films at Artificial Aging Treatment under Lower Temperature

Materials Science Forum ◽

10.4028/www.scientific.net/msf.804.43 ◽

2014 ◽

Vol 804 ◽

pp. 43-46

Author(s):

Si Zhao Zhang ◽

Xue Guang Luo ◽

Feng Ding ◽

Ke Li ◽

Xiao Yan Lin ◽

...

Keyword(s):

Artificial Aging ◽

Aging Treatment ◽

Degradation Process ◽

Low Density Polyethylene ◽

Low Density ◽

Force Microscopy ◽

Atomic Force ◽

Ft Ir ◽

Lower Temperature ◽

Chemical Groups

Low density polyethylene (LDPE) films added thermal catalyst were investigated at artificial aging time of 0, 10, 20, and 30 days, respectively. The samples obtained were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), gel permeation chromatograph (GPC) and fourier transform infrared spectroscopy (FT-IR). It shows that the surface of film was destroyed via thermocatalytic reactions at lower temperature. In addition, the changes of chemical groups were also observed in the thermocatalytic degradation process. Thus, the validation to the thermocatalytic route has been confirmed over lower temperature excitation. It is hoped that our work may provide a new insight into the degradation of polymeric films at lower temperature.

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Precipitation Hardening at Elevated Temperatures above 400 °C and Subsequent Natural Age Hardening of Commercial Al–Si–Cu Alloy

Materials ◽

10.3390/ma14237155 ◽

2021 ◽

Vol 14 (23) ◽

pp. 7155

Author(s):

Ruoqi Li ◽

Naoki Takata ◽

Asuka Suzuki ◽

Makoto Kobashi ◽

Yuji Okada ◽

...

Keyword(s):

Artificial Aging ◽

Elevated Temperatures ◽

Solution Treatment ◽

Age Hardening ◽

Nominal Composition ◽

Cu Alloy ◽

Long Duration ◽

Cast Alloys ◽

Lower Temperature ◽

Impurity Elements

The precipitation of intermetallic phases and the associated hardening by artificial aging treatments at elevated temperatures above 400 °C were systematically investigated in the commercially available AC2B alloy with a nominal composition of Al–6Si–3Cu (mass%). The natural age hardening of the artificially aged samples at various temperatures was also examined. A slight increase in hardness (approximately 5 HV) of the AC2B alloy was observed at an elevated temperature of 480 °C. The hardness change is attributed to the precipitation of metastable phases associated with the α-Al15(Fe, Mn)3Si2 phase containing a large amount of impurity elements (Fe and Mn). At a lower temperature of 400 °C, a slight artificial-age hardening appeared. Subsequently, the hardness decreased moderately. This phenomenon was attributed to the precipitation of stable θ-Al2Cu and Q-Al4Cu2Mg8Si6 phases and their coarsening after a long duration. The precipitation sequence was rationalized by thermodynamic calculations for the Al–Si–Cu–Fe–Mn–Mg system. The natural age-hardening behavior significantly varied depending on the prior artificial aging temperatures ranging from 400 °C to 500 °C. The natural age-hardening was found to strongly depend on the solute contents of Cu and Si in the Al matrix. This study provides fundamental insights into controlling the strength level of commercial Al–Si–Cu cast alloys with impurity elements using the cooling process after solution treatment at elevated temperatures above 400 °C.

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Effects of aging treatment on the precipitation behaviors and mechanical properties of Al-5.0Mg-3.0Zn-1.0Cu cast alloys

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.155707 ◽

2020 ◽

Vol 842 ◽

pp. 155707

Author(s):

Hua-Ping Tang ◽

Qu-Dong Wang ◽

Colin Luo ◽

Chuan Lei ◽

Tian-Wen Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Aging Treatment ◽

Cast Alloys ◽

Effects Of Aging

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T4 and T6 Treatment of 6061 Al-15 Vol. % SiCP Composite

ISRN Materials Science ◽

10.5402/2012/374719 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 11

Author(s):

S. Rajasekaran ◽

N. K. Udayashankar ◽

Jagannath Nayak

Keyword(s):

Room Temperature ◽

Artificial Aging ◽

Brinell Hardness ◽

Natural Aging ◽

Aging Treatment ◽

Temperature History ◽

Peak Hardness ◽

Aging Behavior ◽

Hardness Variation ◽

Peak Aging

Aging temperature history has profound effect on the mechanical and corrosion behavior of 6061 Al/SiC composite. In order to understand the effect of aging on the corrosion resistance, the natural and artificial aging behavior of 15 vol. % 6061 Al-SiCP composites was studied using the aging treatment and the Brinell hardness measurements. The aging curves for the composite (T6 treated) were determined at various aging temperatures such as room temperature, 140, 160, 180, 200, 220, and 240°C. According to the peak hardness variation with temperature profile, it is found that the composite is underaged at 140°C and 160°C. Peak aging takes place at 180°C. Overaging takes place at 200°C, 220°C, and 240°C. The natural aging characteristics of the composite (T4 treated) are also studied using the Brinell hardness measurements.

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Study on Microstructure and Property of Al-Si-Cu-Mg Casting Alloy during Solution and Aging Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.915-916.650 ◽

2014 ◽

Vol 915-916 ◽

pp. 650-653

Author(s):

Li Jun Wei ◽

Bo Long Li ◽

Liu Yi Guan ◽

Zuo Ren Nie

Keyword(s):

Solid Solution ◽

Artificial Aging ◽

Treatment Process ◽

Solution Treatment ◽

Aging Treatment ◽

Solution Time ◽

Casting Alloy ◽

The Matrix ◽

Optimum Heat ◽

Optimum Heat Treatment

The effect of the alloying elements Cu and Mg, the solution and artificial aging process on the microstructure and property were investigated. Solution treatment was carried out at 535 ± 5°C in different time for the Al-Si-Cu-Mg casting alloy, and the artificial aging was carried out at 160 ± 5°C and 175 ± 5°C and190 ± 5°C in different time. The microstructure has been investigated by Optical Microscopy, Scanning Electron Microscopy (SEM). We found that most of Cu and Mg element in the alloy gathered and formed multivariate composite phase at grain boundaries. With the increasing of solid solution time, the intermetallic phases will be dissolution into the matrix, and if the solid solution time is long enough, they will be distributed uniformly in alloy. With the increase of the aging temperature, the time for aging peak will be shorter, but the peak will be lower. Finally, we determine the optimum heat treatment process is 535°C × 12h + 175°C × 8h。

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