Hot Deformation Mode and TMP in Aluminum Alloys

McQueen, H.J.; Kassner, M.E.

doi:10.1002/9781118787922.ch6

Cited by 9 publications

(39 citation statements)

References 38 publications

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“…The flow curves σ t -ε t observed at high temperature range are typical for Al-based materials undergoing intense dynamic recovery during deformation [25]. The samples deformed at 473 K -773 K did not fracture within the deformation range used in the compression test (max.…”

Section: Mechanical and Physical Propertiesmentioning

confidence: 99%

Silver Matrix Composite Reinforced by Aluminium-Silver Intermetallic Phases

Włoch

Skrzekut

Sobota

et al. 2017

Archives of Metallurgy and Materials

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Silver and aluminum powders (82 mass % Ag and 18 mass % Al) were mixed and hot extruded at 673 K with extrusion ratio λ = 25. Performed X-ray diffraction analysis of as extruded rod revealed the development of Ag 3 Al and Ag 2 Al-type intermetallic phases. Structural observations and both chemical and diffraction analysis of structural components confirmed the growth of mentioned phases in the vicinity of elementary Al and Ag granules. No pores or voids were observed in the material. Mechanical properties of the composite, UTS = 490MPa, YS = 440 MPa, HV2 = 136, were relatively high if compared to commercial Ag and Cu products. Hot compression tests pointed to the good hot workability of the composite at deformation temperature range 473 K -773 K.The differential scanning calorimetry tests were performed in order to estimate structural processes during heating of Ag/ Al composite that lead to thermodynamically stable liquid state. It was found that characteristic temperature of three endothermic peaks correspond to (1) peritectoid transformation μ-Ag 3 Al → ζ-Ag 2 Al + (Ag), (2) the eutectic melting ζ-Ag 2 Al + (Al) → L, (3) melting of the ζ-Ag 2 Al phase.The Vickers hardness of the samples annealed at 673 K, for the time range up to 6900 minutes, was also determined. It was concluded that mutual diffusion of elements between Ag and Al granules and the growth of μ-Ag 3 Al and ζ-Ag 2 Al grains during annealing at 673 K result in a slight hardening of the composite.

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Section: Mechanical and Physical Propertiesmentioning

confidence: 99%

Silver Matrix Composite Reinforced by Aluminium-Silver Intermetallic Phases

Włoch

Skrzekut

Sobota

et al. 2017

Archives of Metallurgy and Materials

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“…Therefore, the hot deformation behavior of metals and alloys has been an important scientific issue. As an indication of the degree of difficulty during hot deformation processes, hot deformation activation energy is typically used to estimate the hot workability and to optimize the hot working process of metals and alloys [1][2][3]. For example, a typical application of activation energy is that it is used to derive the constitutive equation, which generally consists of the response of flow stress, strain rate, and deformation temperature.…”

Section: Introductionmentioning

confidence: 99%

The Hot Deformation Activation Energy of 7050 Aluminum Alloy under Three Different Deformation Modes

Sang

2016

Metals

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Abstract:In this study, the hot deformation activation energy values of 7050-T7451 aluminum alloy, calculated with two different methods under three deformation modes, were compared. The results showed that the hot deformation activation energy values obtained with the classical constitutive equation are nearly equivalent under the hot tensile, compression, and shear-compression deformation modes. Average values exhibited an obvious increase when calculated with the modified constitutive equation because it can reflect the variation of activation energy with deformation conditions such as deformation temperature, strain rate and strain state. Moreover, the values under tensile and compression deformation modes were nearly the same regardless of the calculation method. The higher average value under the shear-compression deformation mode with modified equation indicates that the strain state has a significant effect on the hot deformation activation energy. In addition, when the activation energy was investigated for various deformation conditions, the effect of the strain state on the activation energy was more significant. Under a certain condition, the activation energy was the same for the three deformation modes.

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“…Dislocation substructures vary by temperature and strain rate have significant effects on particle distributions [10,11,24] and in superplastic behavior [6,26]. The paper by M. E. Kassner et al compares quench sensitivity of two Al-Mg-Si alloys, and Fare et al consider the effect of severe deformation on aging.…”

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confidence: 99%

“…For Al, improved processing schedules were found for Al-Mg-Si alloys in press quenching after hot extrusion and in solution treating before cold impact extrusion [5][6][7][8][9][10]. The wide variety of TMP for Al is found in a recent book [11] that relates it to all classes of alloys and to rolling [12][13][14][15][16], extrusion [8,9,16], and forging [17]. TMP has spread to many metals as noted in the adjoining papers developed to level that modeling is possible [18].…”

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confidence: 99%

“…If a step obliterates the previous microstructures, then the whole sequence does not qualify as TMP [7,10,11,16]. Time or space breaks are permitted, for example, multistage cold rolling to suitable strain, annealing to a fine grain size and finally deep drawing or preaging an Al autobody panel so that precipitation is completed in the paint baking process [21].…”

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confidence: 99%

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