Identification of the “Overburning” Phenomenon for Alloy 2014 Semiproducts

Резник, П. Л.; Чикова, О. А.; Ovyasnnikov, B. V.; Doroshenko, N. M.

doi:10.1007/s11041-017-0143-8

Cited by 4 publications

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“…It is important to note that the structure obtained after homogenization at 475+510 °C is favorable for further deformation. It does not contain signs of overburning [21]. It does not contain pores or signs of melting of grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

Influence of Homogenization Heat Treatment and Cooling Modes on Microstructure of AA7475 Aluminum Alloy Ingot

Резник

Ovsyannikov²

2020

MSF

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Microstructure evolution during the homogenization heat treatment of an Al-Zn-Cu-Mg (AA7475, which is typically used for the manufacture of aircraft design) alloy, was investigated using a combination of light microscopy, scanning electron microscopy (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Ingots after different types (one-or two-steps treatments) of temperatures (from 380 to 510 °C) of homogenization and cooling conditions (cooling with an air or quenching to water) were investigated. The results show that the microstructure of ingot presents a typical microstructure with some isolated Al7Cu2Fe particles, which after homogenization almost remains in both the size and morphology. The structure ingot after homogenization below 400 °C contains secondary phases, based on η (MgZn2), S (Al2CuMg) and T (Al2Mg3Zn3) are distributed along the grain boundary. In the T (Al2Mg3Zn3) phase copper dissolves up to 30 wt.%. Then the increase in temperature and the complication of heat treatment of homogenization, which led to the complication of the kinetics of the evolution of inter-dendritic phases, were found. The two-steps homogenization has a better effect than a single homogenization, as its completely dissolution of non-equilibrium phases was established.

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Section: Resultsmentioning

confidence: 99%