Effects of Post-Sinter Processing on an Al–Zn–Mg–Cu Powder Metallurgy Alloy

Harding, Matthew D.; Donaldson, I.W.; Hexemer, R. L.; Bishop, D.P.

doi:10.3390/met7090370

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…Although the scope of that study did not include fatigue testing, more recent work on a 7xxx series aluminum alloy has demonstrated significant variations in fatigue strength by altering the sizing parameters [7]. Here, the three-point bending fatigue strength of an Al-5.6Zn-2.5Mg-1.6Cu PM alloy was reduced by 23% when sizing was done immediately after quenching.…”

Section: Introductionmentioning

confidence: 90%

Effects of process variables on the mechanical and physical properties of an Al–Cu–Mg powder metallurgy alloy

Christensen

Donaldson²,

Bishop

2019

SN Appl. Sci.

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The objective of this research was to analyze the effect sizing and heat treatment had on the properties of a 2xxx series aluminum powder metallurgy alloy. Al-2.3Cu-1.5Mg-0.5Sn was used for experimental work. Natural and artificial aging was studied, as well as various sizing pressures and delay times between process steps (ex. sintering and sizing). It was determined that sizing increased tensile yield strength but decreased tensile ductility and fatigue resistance. Yield strength increased as much as 32% when sized at 400 MPa, whereas ductility and fatigue strength were reduced by up to 51% and 31%, respectively. Delay time between sintering and sizing (T2 samples) did not appear to significantly impact mechanical properties. Through differential scanning calorimetry it was determined that sizing impacted the precipitation of S-type precipitates. It was inferred that there was a preferential tendency for S1-type precipitates to form in sized samples, suppressing full aging to S2-type.

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Section: Introductionmentioning

confidence: 90%

Effects of process variables on the mechanical and physical properties of an Al–Cu–Mg powder metallurgy alloy

Christensen

Donaldson²,

Bishop

2019

SN Appl. Sci.

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“…In recent decades, Al-based PM materials have been developed to expand the application of the automobile field [4][5][6]. Efforts have largely addressed the development of PM counterparts to wrought or cast alloys that span a broad range of properties [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Yuan

Yin

et al. 2021

Metals

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This present work investigates the effects of sintering temperature on densification, mechanical properties and microstructure of Al-based alloy pressed by high-velocity compaction. The green samples were heated under the flow of high pure (99.99 wt%) N2. The heating rate was 4 °C/min before 315 °C. For reducing the residual stress, the samples were isothermally held for one h. Then, the specimens were respectively heated at the rate of 10 °C/min to the temperature between 540 °C and 700 °C, held for one h, and then furnace-cooled to the room temperature. Results indicate that when the sintered temperature was 640 °C, both the sintered density and mechanical properties was optimum. Differential Scanning Calorimetry, X-ray diffraction of sintered samples, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, and Transmission Electron Microscope were used to analyse the microstructure and phases.

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“…The plates and bars of Al-Zn-Mg-Cu alloy prepared by traditional processes such as casting and plastic deformation have inferior mechanical properties because of coarse microstructure and uneven distribution of the second phase [3,4]. Recently, it is reported that injection molding [5] and powder metallurgy processes [6,7] can significantly improve the mechanical properties of the alloys. However, the grain sizes of the alloys obtained from these methods are all on the scale of micrometers.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Nanocrystalline Al-Zn-Mg-Cu Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

Cheng

Cai

et al. 2019

Materials

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In this study, Al, Zn, Mg and Cu elemental metal powders were chosen as the raw powders. The nanocrystalline Al-7Zn-2.5Mg-2.5Cu bulk alloy was prepared by mechanical alloying and spark plasma sintering. The effect of milling time on the morphology and crystal structure was investigated, as well as the microstructure and mechanical properties of the sintered samples. The results show that Zn, Mg and Cu alloy elements gradually dissolved in α-Al with the extension of ball milling time. The morphology of the ball-milled Al powder exhibited flaking, crushing and welding. When the ball milling time was 30 h, the powder particle size was 2–5 μm. The α-Al grain size was 23.2 nm. The lattice distortion was 0.156% causing by the solid solution of the metal atoms. The grain size of ball-milled powder grew during the spark plasma sintering process. The grain size of α-Al increased from 23.2 nm in the powder to 53.5 nm in the sintered sample during the sintering process after 30 h of ball milling. At the same time, the bulk alloy precipitated micron-sized Al2Cu and nano-sized MgZn2 in the α-Al crystal. With the extension of ball milling time, the compression strength, yield strength and Vickers hardness of spark plasma sintering (SPS) samples increased, while the engineering strain decreased. The compression strength, engineering strain and Vickers hardness of sintered samples prepared by 30 h milled powder were ~908 MPa, ~8.1% and ~235 HV, respectively. The high strength of the nanocrystalline Al-7Zn-2.5Mg-2.5Cu bulk alloy was attributed to fine-grained strengthening, dislocation strengthening and Orowan strengthening due to the precipitated second phase particles.

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Effects of Post-Sinter Processing on an Al–Zn–Mg–Cu Powder Metallurgy Alloy

Cited by 8 publications

References 25 publications

Effects of process variables on the mechanical and physical properties of an Al–Cu–Mg powder metallurgy alloy

Effects of process variables on the mechanical and physical properties of an Al–Cu–Mg powder metallurgy alloy

Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Microstructure and Mechanical Properties of Nanocrystalline Al-Zn-Mg-Cu Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

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