DURALIUM BEHAVIOR IN MULTISTAGE ARTIFICIAL AGING PROCESS

2017 ◽  
Vol 8 (3) ◽  
pp. 223-230
Author(s):  
Poppy Puspitasari ◽  
Dewi Izza
Keyword(s):  
Aging Process ◽  
Artificial Aging

Investigation on the Stress Relaxation Aging Behavior of 2195 Al-Li Alloy

2021 ◽  
Vol 315 ◽  
pp. 37-42
Author(s):  
Hai Long Liao ◽  
Li Hua Zhan ◽  
Yuan Gao ◽  
Xue Ying Chen ◽  
Ming Hui Huang
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
High Performance ◽  
Aging Process ◽  
Artificial Aging ◽  
Ageing Time ◽  
High Strength ◽  
Aging Behavior ◽  
Stress Corrosion Resistance ◽  
Scanning Electron

2195 Al-Li alloy is famous for high strength, excellent fatigue strength and good stress corrosion resistance, which is widely used in the manufacture of high-performance aerospace components. The aim of this study is to validate how the stress relaxation aging behavior effect on the mechanical properties of 2195 Al-Li alloy. Through mechanical property test, the research was found that the performance after stress relaxation aging is higher than artificial aging (AA). In addition, the analysis of scanning electron microscopy SEM and TEM revealed that dislocations should be introduced by the stress relaxation aging process, which is more conducive to the precipitation of the T1 phase and strengthened the material with prolong ageing time. The results show that stress relaxation aging can significantly promote the precipitation of the T1. Therefore, this paper sheds new light on how SRA can improve mechanical properties and that SRA make better improve the distribution of precipitates in the grain boundary.

scholarly journals Effects of Pre-Stretching on Creep Behavior, Mechanical Property and Microstructure in Creep Aging of Al-Cu-Li Alloy

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 333 ◽  
Author(s):  
Jin Zhang ◽  
Zhen Jiang ◽  
Fushun Xu ◽  
Mingan Chen
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Dislocation Density ◽  
Creep Behavior ◽  
Aging Process ◽  
Artificial Aging ◽  
Dislocation Motion ◽  
Nucleation And Growth ◽  
Blocking Effect ◽  
Creep Stage

The effects of pre-stretching on creep behavior, mechanical properties and microstructure during the creep aging process of Al-Cu-Li alloy were investigated. AA2195 was taken as the representative of Al-Cu-Li alloys. It is found that the total creep strain and strength property of creep aged AA2195 specimens can be improved through effective pre-stretching. Unlike with artificial aging, yield strength increased increasing by 47%. The TEM images show that the constitution of aging precipitates in the creep-aged specimens are obviously changed by pre-stretching. Precipitates in the 2% pre-stretched specimen are mainly composed of T1 phase, while a great amount of θ’ phase accompanied with a few T1 phase were found in the non-pre-stretched specimen. Moreover, pre-stretching introduces many dislocations which benefit the creep deformation, but the increasing dislocation density also accelerates the nucleation and growth of the precipitates as well. The premature T1 phase has a great blocking effect to the dislocation motion, creating a lower decrease rate but a longer duration in the early creep stage. Except for the initial dislocations, the dislocation motion in the creep aging process is also a favorable factor to precipitate the T1 phase.

Effect of Artificial Aging Process on Aluminum Foam Made of Etial 160

2020 ◽  
Vol 73 (11) ◽  
pp. 2739-2745
Author(s):  
Lütfiye Dahil ◽  
Ramazan Katirci ◽  
Halil İbrahim Sümbül
Keyword(s):  
Aging Process ◽  
Artificial Aging ◽  
Aluminum Foam

Contaminant release from aged microplastic

2017 ◽  
Vol 14 (6) ◽  
pp. 394 ◽  
Author(s):  
Nicole Bandow ◽  
Verena Will ◽  
Volker Wachtendorf ◽  
Franz-Georg Simon
Keyword(s):  
Material Properties ◽  
High Density Polyethylene ◽  
Aging Process ◽  
Artificial Aging ◽  
Degradation Products ◽  
Total Content ◽  
Oxidation Reactions ◽  
Inorganic Species ◽  
Aging Conditions ◽  
Contaminant Release

Environmental contextIncreasing global plastic production adds plastic debris to the environment. We show that potentially harmful additives present in plastic particles are released to water at an increased rate when material properties change by aging due to exposure to high temperature and especially to UV radiation. For risk assessment of such plastic additives, more information on their degradation products and their toxicity is needed. AbstractRecycled plastic granules of high-density polyethylene, polyvinyl chloride and polystyrene the size of microplastics were exposed to artificial aging conditions (2000h; photooxidative and thermo-oxidative) to simulate their fate outdoors. Their potential to leach into water during the aging process was investigated using column percolation tests. Aging-related changes on the surface of the material were characterised by IR measurements indicating oxidation reactions with the formation of new adsorption bands (C=O, C–O and OH), especially in the case of photooxidative aging. These findings were confirmed by the identification of leachable organic compounds. Leaching of total organic carbon, Cl, Ca, Cu and Zn is clearly affected by changes due to aging, and their release is increased after photooxidative aging. In general, exposure to photooxidative conditions shows a greater influence on aging and thus on leaching and seems to be the more important mechanism for the aging of microplastic in the environment. Comparison with the total content of inorganic species revealed that, for most elements, less than 3% of the total content is released after 2000h of photooxidative aging.

scholarly journals Effect of at-home bleaching with different thickeners and aging on physical properties of a nanocomposite

2016 ◽  
Vol 10 (01) ◽  
pp. 082-091 ◽  
Author(s):  
Thayla Hellen Nunes Gouveia ◽  
Juliana do Carmo Públio ◽  
Glaucia Maria Bovi Ambrosano ◽  
Luís Alexandre Maffei Sartini Paulillo ◽  
Flávio Henrique Baggio Aguiar ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Physical Properties ◽  
Aging Process ◽  
Artificial Aging ◽  
Organic Matrix ◽  
Carbamide Peroxide ◽  
Treatment Control ◽  
Force Microscopy ◽  
Atomic Force ◽  
Knoop Microhardness

ABSTRACT Objective: To evaluate the influence of 16% carbamide peroxide (CP) containing different thickeners on the physical characteristics of a nanocomposite resin submitted or not to accelerated artificial aging (AAA). Materials and Methods: One hundred samples were randomly distributed into two groups (n = 50) according to AAA. Each group was divided into 5 subgroups (n = 10) depending on the bleaching/thickener treatment: CP + carbopol, CP + natrosol, carbopol, natrosol, and no treatment (control). The physical properties tested were color (ΔE), gloss (GU), mean roughness (Ra), and Knoop microhardness (KHN). The resin surface was performed with atomic force microscopy (AFM). Statistical Analysis: The color (variable Δ E) was assessed with two-way analysis of variance (ANOVA) and additionally with Tukey's and Dunnett's tests, the roughness values were submitted to Kruskal–Wallis, Dunn's, and Mann–Whitney's tests. Data on gloss and KHN were submitted to two-way ANOVA and Tukey's test (α = 0.05). Results: Among the physical properties evaluated, CP + carbopol promoted a reduction in composite microhardness only, thus differing statistically from the controls. As for CP + natrosol, such a change was not observed. The aging process reduced all the physical properties, thus differing statistically from the nonaging group. CP + carbopol increased the roughness and decreased the gloss of aged resins, whereas natrosol reduced gloss only, which differed statistically from the controls. Conclusions: AFM showed evidence of the loss of organic matrix and exposure to load particles in the aged samples. Therefore, the replacement of carbopol with natrosol provided maintenance of the composite microhardness following bleaching. The aging process reduced the physical properties evaluated, and some changes were enhanced by the application of bleaching.

Degradation Behaviour of Zeolite Filled Polyurethanes under In Vitro Aging Process

2015 ◽  
Vol 812 ◽  
pp. 83-88
Author(s):  
Peter Kaali ◽  
György Czél
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Artificial Aging ◽  
Surface Pattern ◽  
Degradation Behaviour ◽  
Total Exposure Time ◽  
Polyurethane Composites ◽  
Over Time ◽  
Release Processes

In this study the degradation and ion/zeolite release processes of in vitro aged zeolite loaded polyurethane composites were evaluated. Two in vitro artificial aging solutions were used; artificial lysosomal fluid (ALF) and Gamble ́s solution and the total exposure time was 12 weeks. Periodically, SEM micrographs were taken of the surface of polyester type polyurethane-zeolite composites. After exposure to ALF solution the samples showed round holes and a rougher surface in general over time. Micrographs of the samples immersed in Gamble’s solution exhibited different signs of degradation with damage features on the surfaces, understood as black holes and a rougher surface pattern. In addition varying amount of salt was also observed on the surfaces that might influence the ion/zeolite release. Furthermore, the zeolite filler caused remarkable changes in mechanical properties after the aging process, which could not be discerned.

scholarly journals Study on aging parameters and effect of rice wine based on aging device

2021 ◽  
Vol 233 ◽  
pp. 02043
Author(s):  
Hongjun Ni ◽  
Kaixuan Wang ◽  
Qijun Shi ◽  
Shuaishuai Lv ◽  
Yonglan Liu ◽  
...  
Keyword(s):  
Aging Process ◽  
Artificial Aging ◽  
Natural Aging ◽  
Aging Effect ◽  
Rice Wine ◽  
Total Acid ◽  
Aging Period ◽  
Orthogonal Experiments ◽  
One Year ◽  
Wine Aging

Rice wine is a kind of low alcohol and high nutrition four season drinking wine made from water and glutinous rice. Generally, new rice wine needs to undergo a natural aging process for about 1 year. In order to solve the problems of long natural aging period and poor aging effect of rice wine, a set of rice wine aging device was designed and a comprehensive method was used to age the rice wine. By orthogonal experiments, the optimal aging process parameters were determined, which were temperature 55 °C, aging time 12 days, and hydrogen peroxide addition 4 mL/200 mL. The results show that the content of ethyl acetate and ethyl lactate in rice wine are 0.44 g/L and 0.80 g/L respectively and the content of total acid and total sugar reaches 6.9 g/L and 230.2 g/L respectively. Compared with naturally aged rice wine, it is verified that the effect of artificial aging can achieve the effect of natural aging for one year. This experiment provides a new method for the study of artificial aging of rice wine.

Effect of Artificial Aging on Aluminum Extrusion Alloy for Automobile Bumper

2011 ◽  
Vol 695 ◽  
pp. 190-193
Author(s):  
Sun Dae Kim ◽  
Hoon Cho ◽  
Do Hyang Kim
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Artificial Aging ◽  
Precipitation Hardening ◽  
Volume Fraction ◽  
High Strength ◽  
Atomic Ratio ◽  
Aluminum Extrusion ◽  
Extrusion Alloy ◽  
Processing Factors

The heat-treatable, precipitation-hardening, aluminum alloys are of special interest for automobile where high strength and dent resistance are required, and for bumpers, where good strength and shock absorption are needed. In both cases, good formability is also an important requirement. The heat-treatable 6000-series Al-Mg-Si alloys have been the material of choice for automobile. Despite the high strengthening potential of Al-Mg-Si alloys, processing factors such as the artificial aging processes, as well as the duration of artificial aging, can seriously impede the strengthening process. The highest tensile strength of A6082 alloy was obtained when Mg/Si atomic ratio is set to 1.1 due to the biggest volume fraction of intermetallic compound containing Mg and Si. It was to determine how aging process affected the microstructure and mechanical properties of the A6082 alloy as different ratio between Mg and Si.

scholarly journals Evaluation of the Precipitation Process of a Clad Pipe by the Thermoelectric Potential Technique

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1274
Author(s):  
Ricardo Carabes ◽  
Héctor Carreón ◽  
Maria L. Carreon ◽  
Melchor Salazar ◽  
Pedro Hernández
Keyword(s):  
Aging Process ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Treatment Temperature ◽  
Precipitation Process ◽  
Solution Treatment Temperature ◽  
Subsequent Aging ◽  
X65 Steel ◽  
Api 5L X65 Steel

The article reports a study carried out on metallic samples extracted from a metallurgically bonded clad pipe (API 5L X65 steel-Inconel 825 alloy) subjected to a solution heat treatment at 1200 °C and a subsequent aging treatment at 650 °C for different times in order to promote microstructural changes in thermo-metallurgical bonded materials. The non-destructive thermoelectric potential (TEP) technique was used to monitor microstructure changes due to the artificial aging process. In addition, micro-hardness tests were carried out on the metallic materials and micrographs were obtained by means of an optical and scanning electron microscope (SEM). The TEP value changed with solution treatment temperature and reached a maximum value for solution treatment at 1200 °C. The changes in TEP during solution treatment were caused by changes in the solubility of the alloying elements. In the artificial aging process, the TEP value decreased with increasing aging time due to the precipitation process, but exhibited distinct characteristics for the different zones at the clad pipe samples.

Microstructure and Mechanical Properties of ZK60 Alloy Sheets during Aging

2007 ◽  
Vol 558-559 ◽  
pp. 159-164 ◽  
Author(s):  
Jae Hyung Cho ◽  
Y.M Jin ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aging Time ◽  
Solution Heat Treatment ◽  
Aging Process ◽  
Artificial Aging ◽  
Warm Rolling ◽  
Microstructure And Mechanical Properties ◽  
Zk60 Alloy

Variations in microstructure and mechanical properties of ZK60 alloy sheets were investigated with aging time. ZK60 alloy sheets with a thickness of 1mm were prepared from a casting ingot followed by homogenization and warm-rolling. Artificial aging process after solution heat treatment (T6) affected both hardness variations and precipitates distributions with aging time. Hardness variations were related to precipitates, i.e. rod-shaped ( 1 β ′ ) or disc shaped ( 2 β ′ ) particles. Rod-shaped ( 1 β ′ ) precipitates mainly consist of Mg and Zn without Zr.

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