A Novel Solution Heat Treatment of 7075‐Type Alloy

Ibrahim, M. F.; Samuel, A. M.; Alkahtani, Saleh A.; Samuel, F. H.

doi:10.1002/9781118663189.ch67

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Artificial age hardening of the 7075-type alloys is considered the main source of alloy strength. Several aging procedures were reported in the literature: single aging treatment (aging at 120 • C for certain aging times [1][2][3][4][5]) and double aging (two-step-process at two different aging temperatures [6,7]). According to the authors, increasing the concentration of the η 1 phase (MgZn 2 ) particles following double aging heat treatment was effective in improving the alloy strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on the Strength and Microstructure of 7075-Based Alloys Containing 2% Li and/or 0.12% Sc

Tahmasbi,

Samuel,

Zedan

et al. 2023

Materials

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The present study was performed on three versions of 7075 alloy to which Sc or Sc + Li was added. The alloys were subjected to various aging treatments. The microhardness results show that the highest value of hardness was achieved when the alloy containing Li + Sc was aged at 120 °C for 24 h whereas the minimum level was exhibited by the base alloy aged at 280 °C. The results were interpreted in terms of the size and distribution of the main hardening phase (η′(MgZn2)), and the role of the presence of Al and Cu in the used alloy. Precipitation of Al3(Sc, Zr, Ti) phase particles during solidification of the Sc-containing ingots was also discussed. The coarsening and spheroidi-zation of η-phase particles take place through the Ostwald ripening mechanism while smaller par-ticles in solution dissolve and deposit on larger particles. In Sc-containing alloys, star phase particle consists of different layers. The change in the brightness from layer to layer indicates that the Zr and Sc concentrations are varied within the star phase, since the atomic number of Zr (40) is higher than the atomic number of Sc (21). The addition of Sc, as well, leads to marked decrease in the grain size of the as-cast alloys i.e., 300 µm and 45 µm, respectively. The interaction between Li and Sc would reduce the effectiveness of the grain refining effect of Sc. The results of the refining effect of Sc were confirmed using the EBSD technique.

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Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on the Strength and Microstructure of 7075-Based Alloys Containing 2% Li and/or 0.12% Sc

Tahmasbi,

Samuel,

Zedan

et al. 2023

Materials

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“…The mechanical properties of EN AW‐7075 alloy can be modified by heat‐ and thermomechanical treatment, [ 12–14 ] and various procedures were developed for tuning of the mechanical properties depending on different requirements of numerous applications. [ 15,16 ] Recently, novel thermomechanical treatments were employed to further improve the mechanical behavior of EN AW‐7075 alloy. [ 12–14,17 ] Stress aging was found to be capable of enhancing the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Low‐Cycle‐Fatigue Performance of Stress‐Aged EN AW‐7075 Alloy

et al. 2023

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The effect of a novel heat treatment, that is, aging under superimposed external stress, on the fatigue performance and microstructural evolution of a high‐strength aluminum alloy (EN AW‐7075) is presented. Stress aging, a combination of heat treatment and superimposed external stress, can enhance the mechanical properties of EN AW‐7075 under monotonic loading due to the acceleration of precipitation kinetics. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) reveal that a longer aging time and the presence of superimposed stress both promote the formation and growth of precipitates, that is, the precipitation of strengthening η´ precipitates. This is confirmed by differential scanning calorimetry (DSC) heating experiments of stressless and stress‐aged states. Furthermore, stress aging leads to a reduction of dimensions of precipitate‐free zones near grain boundaries. Cyclic deformation responses (CDRs) and half‐life hysteresis loops are evaluated focusing on the low‐cycle fatigue (LCF) performance of different conditions. A noticeable cyclic hardening seen in case of the specimens aged for a short time indicates the occurrence of dynamic strain aging (DSA). Eventually, stress aging allows for an enhancement of the monotonic mechanical properties of EN AW‐7075 without degrading the cyclic performance in the LCF regime.

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Experimental Study on Contact Heating Method in Solid Solution Process of Aluminum Alloy

An¹,

Xie²,

Sun³

et al. 2023

Atlantis Highlights in Materials Science and Technology

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In this paper, the contact heating method was adopted to heat the aluminum alloy instead of furnace heating. During the process, the aluminum alloy sheet was placed in the preheated flat die under a certain press force for several seconds until the sheet reach the preset temperature. The heating curves were recorded by thermal couples buried in the heating die blocks. Microstructure after contact heating was observe by transmission electron microscope. The results show that sheet temperature rises quickly after the heating die closed and the temperature can reach 475 °C in 10 s which is much faster than furnace heating. Microstructure evolution confirms that solid solution is almost completed after contact heating.

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A Novel Solution Heat Treatment of 7075‐Type Alloy

Cited by 4 publications

References 16 publications

Effect of Aging Treatment on the Strength and Microstructure of 7075-Based Alloys Containing 2% Li and/or 0.12% Sc

Effect of Aging Treatment on the Strength and Microstructure of 7075-Based Alloys Containing 2% Li and/or 0.12% Sc

Low‐Cycle‐Fatigue Performance of Stress‐Aged EN AW‐7075 Alloy

Experimental Study on Contact Heating Method in Solid Solution Process of Aluminum Alloy

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