Age-hardening behavior of Al–10%Si–0.3%Mg alloy with water quenching and direct quenching after solution treatment

This study presents an application of high-pressure torsion (HPT) to an Al-Li-Cu-Mg alloy (2091). The alloy was subjected to solid solution treatment at 505oC for 30 minutes and was processed by HPT under 6 GPa for 5 revolutions at room temperature. The hardness increased with straining and saturated to a constant level at 225 Hv. Aging was undertaken on the HPT-processed alloy at 100, 150 and 190oC for the total periods up to 9.3 days. The aging treatment led to a further increase in the hardness to ~275 Hv. It is shown that the simultaneous strengthening of the alloy due to grain refinement and age hardening was successfully achieved by application of HPT and subsequent aging treatment. The enhancement of the strength is prominent when compared with the application of a conventional rolling process.

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Age-hardening behavior of Al-1%Mn-1%Mg alloy.

Journal of Japan Institute of Light Metals ◽

10.2464/jilm.39.3 ◽

1989 ◽

Vol 39 (1) ◽

pp. 3-7 ◽

Cited By ~ 4

Author(s):

Takashi INABA ◽

Eiki USUI ◽

Noboru SHINANO

Keyword(s):

Mg Alloy ◽

Age Hardening ◽

Hardening Behavior

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Effect of Impact Compression on Age Hardening Behavior of Aluminum Alloys

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.566.409 ◽

2014 ◽

Vol 566 ◽

pp. 409-414 ◽

Cited By ~ 4

Author(s):

Yuki Kitani ◽

Keitaro Horikawa ◽

Hidetoshi Kobayashi ◽

Kenichi Tanigaki ◽

Tomo Ogura ◽

...

Keyword(s):

Aluminum Alloy ◽

Aluminum Alloys ◽

Aging Time ◽

Point Defects ◽

Solution Treatment ◽

Age Hardening ◽

Impact Compression ◽

6061 Aluminum Alloy ◽

Hardening Behavior ◽

The Impact

The effect of impact compression on age hardening behavior was examined for Meso20 and 6061 aluminum alloys using a single stage gun. The hardness of Meso20 and 6061 aluminum alloy applied with an impact compression (about 5.0GPa) after the solution treatment increased with the aging time. The cluster of point defects like stacking fault tetrahedral (SFT) was observed in the 6061 aluminum alloys with the impact compression (5.3GPa) after the solution treatment. Even after the impact compression, distribution of the aging precipitates was clearly identified.

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Analyzing Si Precipitation on Age Hardening of an Al-Si-Mg Cast Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.146-147.1685 ◽

2010 ◽

Vol 146-147 ◽

pp. 1685-1689

Author(s):

Gui Qing Wang ◽

Yan Liu ◽

Guo Cheng Ren ◽

Zhong Kui Zhao

Keyword(s):

Cast Alloy ◽

Solution Treatment ◽

Hardness Measurement ◽

Mg Alloy ◽

Age Hardening ◽

Micro Hardness ◽

Tem Analysis ◽

Cast Sample ◽

Transmission Electron ◽

Cast Condition

The correlation of age hardening behavior and Si precipitation in α(Al) of Al-8wt%Si-0.35wt%Mg alloy has been investigated by micro hardness measurement, electron probe microanalysis (EPMA) and transmission electron microscopy (TEM) analysis. The EPMA results show that Si concentration in the center of α (Al) dendrites is higher than that in the edge and the main concentration is about 1.5wt% for Al-8wt%Si-0.35wt%Mg alloy in as cast condition. After solution treatment at 530 °C for 8 h followed by water quenching (T4 treatment), hardness value decreases 9 HV, which is accompanied by the decrease of Si concentration in α (Al). Aging the as-cast sample and T4 treatment sample at 150 °C for 20 h, the main concentration of Mg and Si in α (Al) changes little. Hardness value after as-cast aging is only 3 HV lower than that after T6 treatment. Nanometer Si particles and β″ and/or β′ phases are found in aged samples. The higher hardness value for as-cast aging samples should contribute to the nanometer Si particles in α (Al).

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Effect of Cu Content on Unique Hardening Behavior of Dental Ag-Pd-Au-Cu System Alloy Subjected to Solution Treatment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.2200 ◽

2010 ◽

Vol 654-656 ◽

pp. 2200-2203

Author(s):

Yong Hwan Kim ◽

Mitsuo Niinomi ◽

Toshikazu Akahori ◽

Masaaki Nakai ◽

Harumi Tsutsumi ◽

...

Keyword(s):

Vickers Hardness ◽

Solution Treatment ◽

Water Quenching ◽

System Alloy ◽

Cu Content ◽

Hardening Behavior ◽

The Relationship

Hardness of Ag-20Pd-12Au-14.5Cu (mass%) subjected to a solution treatment (ST) at a temperature over 1073 K followed by water quenching increases drastically. This unique hardening behavior is not clarified becasue of their complex microsturucures. In this study, the relationship between the unique hardening behaviour and the microstructure of dental Ag-20Pd-12Au-xCu subjected to ST with different Cu/Ag ratios was investigated. The Vickers hardness of Ag-20Pd-12Au-14.5Cu increases remarkably from 192 to 286 Hv after ST whereas that of Ag-20Pd-12Au-6.5Cu decreases and that of Ag-20Pd-12Au-20Cu increases slightly after ST, respectively. The spotty regions are observed in only certain areas of Ag-20Pd-12Au-14.5Cu subject to ST. It is considered that the appearance of the spotty regions affects mainly to the unique hardening behaviour in Ag-20Pd-12Au-xCu.

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Effect of Solution Treatment on Age-Hardening Behavior of Al-12Si-1Mg-1Cu Piston Alloy with Trace-Zr Addition

Journal of Casting & Materials Engineering ◽

10.7494/jcme.2018.2.2.30 ◽

2018 ◽

Vol 2 (2) ◽

pp. 30 ◽

Cited By ~ 1

Author(s):

Mohammad Salim Kaiser

Keyword(s):

Solution Treatment ◽

Age Hardening ◽

Piston Alloy ◽

Hardening Behavior ◽

Zr Addition

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Precipitation in Al-Li-Cu Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096941 ◽

1981 ◽

Vol 39 ◽

pp. 44-45

Author(s):

J. E. O'Neal ◽

K. K. Sankaran

Keyword(s):

Electron Microscopy ◽

Age Hardening ◽

Precipitation Behavior ◽

Zone Formation ◽

Specific Strength ◽

Hardening Behavior ◽

Cu Alloys ◽

High Specific Strength ◽

Transmission Electron ◽

Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

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Effect of Ti Addition to Age Hardening Response of Al-10Zn-6MgxTi Alloy Produced by Squeeze Casting

MATEC Web of Conferences ◽

10.1051/matecconf/201818602009 ◽

2018 ◽

Vol 186 ◽

pp. 02009

Author(s):

Dwi Ayu Nurcahyaningsih ◽

Risly Wijanarko ◽

Irene Angela ◽

Bondan Tiara Sofyan

Keyword(s):

Squeeze Casting ◽

Solution Treatment ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Hardness Measurement ◽

Impact Testing ◽

Age Hardening ◽

Peak Hardness ◽

7Xxx Alloy ◽

Ti Addition

This research focused on investigating the effects of Ti addition on the age hardening response of Al 7xxx alloy for Organic Rankine Cycle (ORC) turbine impeller application in power plant generators. Al-10Zn-6Mg wt. % alloys were produced by squeeze casting with 0.02, 0.05, and 0.25 wt. % Ti addition. As-cast samples were homogenized at 400 °C for 4 h. Solution treatment was conducted at 440 °C for 1 h, followed by quenching and ageing at 130 °C for 200 h. Age hardening result was observed using Rockwell B hardness measurement. Other characterizations included impact testing, STA, optical microscopy, and SEM-EDS. Results showed that the addition of Ti in all content variations increased the as-cast hardness due to the diminution of secondary dendrite arm spacing (SDAS) values of the alloy. Ageing at 130 °C strengthened the alloys, however the addition of Ti was not found to affect neither peak hardness nor impact values of the alloy. Identities of second phases formed during solidification were found to be T (Mg32(Al,Zn)49), β (Al8Mg5), and TiAl3, while precipitates produced during ageing were GP Zone, η′, and η (MgZn2).

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