On the Effect of Quenching on Postweld Heat Treatment of Friction-Stir-Welded Aluminum 7075 Alloy

Sajadifar, Seyed Vahid; Moeini, Ghazal; Scharifi, Emad; Lauhoff, C.; Böhm, Stefan; Niendorf, Т.

doi:10.1007/s11665-019-04252-3

Cited by 36 publications

(28 citation statements)

References 43 publications

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“…Coarse precipitates were formed and segregated along the grain boundaries in the sample processed in the hot die, whereas, fine and dispersed precipitates, similar to that of T6 counterpart, were introduced in the sample processed in the cold die. Lower cooling rates after solution treatment favor the evolution of relatively large precipitates alongside the grain boundaries eventually leading to a reduction of precipitate forming elements in the surrounding areas [10,[36][37][38]. Therefore, the high strength of AA7075 alloy formed and cooled in the cold die can be attributed to the formation of fine and dispersed precipitates after the aging treatment [17,18].…”

Section: Conditions Yield Strength (Mpa) Ultimate Tensile Strength (Mmentioning

confidence: 99%

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Sajadifar

Scharifi

Weidig

et al. 2020

Metals

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This study focuses on the high temperature characteristics of thermo-mechanically processed AA7075 alloy. An integrated die forming process that combines solution heat treatment and hot forming at different temperatures was employed to process the AA7075 alloy. Low die temperature resulted in the fabrication of parts with higher strength, similar to that of T6 condition, while forming this alloy in the hot die led to the fabrication of more ductile parts. Isothermal uniaxial tensile tests in the temperature range of 200–400 °C and at strain rates ranging from 0.001–0.1 s−1 were performed on the as-received material, and on both the solution heat-treated and the thermo-mechanically processed parts to explore the impacts of deformation parameters on the mechanical behavior at elevated temperatures. Flow stress levels of AA7075 alloy in all processing states were shown to be strongly temperature- and strain-rate dependent. Results imply that thermo-mechanical parameters are very influential on the mechanical properties of the AA7075 alloy formed at elevated temperatures. Microstructural studies were conducted by utilizing optical microscopy and a scanning electron microscope to reveal the dominant softening mechanism and the level of grain growth at elevated temperatures.

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Section: Conditions Yield Strength (Mpa) Ultimate Tensile Strength (Mmentioning

confidence: 99%

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Sajadifar

Scharifi

Weidig

et al. 2020

Metals

Self Cite

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“…This undesirable phenomenon occurs during post-weld heat treatment and involves catastrophic growth of a few grains which finally consume almost entire weld zone. It has been observed in various aluminum alloys including 1 xxx [3][4][5][6], 2 xxx [7][8][9][10][11][12][13][14][15][16], 5 xxx [17][18][19][20][21][22][23][24][25][26][27][28][29], 6 xxx [30][31][32][33], and 7 xxx [11,[34][35][36][37][38][39][40][41] series, as well as in magnesium alloys [42][43][44][45], some steels [46][47][48][49], and even metal-matrix composites [50,…”

Section: Introductionmentioning

confidence: 99%

Relationship between welding conditions, abnormal grain growth and mechanical performance in friction-stir welded 6061-T6 aluminum alloy

Kalinenko

Высоцкий

Malopheyev

et al. 2021

Materials Science and Engineering: A

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“…Over the last decades, increasing demand for lightweight materials from multiple industrial applications motivates researchers to focus on aluminum alloys [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Wang

et al. 2020

Metals

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In this study, a twin-roll casting sheet of 6061 aluminum alloy was cooled using furnace, asbestos, air, wind and water. The effect of cooling rate on the microstructure and properties of twin-roll casting 6061 aluminum alloy sheet were studied. Optical microscope, scanning electron microscope, X-ray diffraction, microhardness tester and universal tensile machine were used to observe the microstructure and properties of twin-roll casting sheet of 6061 aluminum alloy. The results show that the higher the cooling rate, the smaller the grain size of the alloy and the smaller the number of precipitated phases in the matrix. Uniform grain size of the alloy could be obtained at a stable cooling rate. The hardness, tensile strength and elongation of the twin-roll casting sheet increased with cooling rate. Under wind cooling condition, the twin-roll casting sheet demonstrated excellent comprehensive performance, i.e., 88 MPa of yield strength, 178 MPa of tensile strength and 15% of elongation, respectively. A quantitative Hall–Petch relation was established to predict the yield strength of 6061 twin-roll casting sheets with different grain sizes and cooling rate.

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On the Effect of Quenching on Postweld Heat Treatment of Friction-Stir-Welded Aluminum 7075 Alloy

Cited by 36 publications

References 43 publications

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Performance of Thermo-Mechanically Processed AA7075 Alloy at Elevated Temperatures—From Microstructure to Mechanical Properties

Relationship between welding conditions, abnormal grain growth and mechanical performance in friction-stir welded 6061-T6 aluminum alloy

Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

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