Characterization of the microstructure, mechanical properties, and shot peening response of an industrially processed Al–Zn–Mg–Cu PM alloy

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

doi:10.1016/j.jmatprotec.2015.02.003

Cited by 23 publications

(14 citation statements)

References 20 publications

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“…These gains in fatigue strength can be attributed to the induced compressive residual stresses caused by inner material resisting the plastic deformation as a result of shot impacting the surface of the sample. The surface in-plane residual stress was measured by XRD (as described in Section 2) to be −297 MPa (standard deviation 8 MPa), which has been shown to persist to a depth of approximately 80 µm in samples processed and peened in a similar manner [34]. This ≈30% increase in fatigue strength from shot peening was also in line with similar studies completed through rotating-bending fatigue [21] as well as published results for wrought 7075 [16,18,35] (showing 20-50% gains).…”

Section: Effects Of Shot Peeningmentioning

confidence: 99%

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

Harding

Donaldson²,

Hexemer³

et al. 2017

Metals

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Abstract:The objective of this work was to study the effects of several post-sinter processing operations (heat-treatment, sizing, shot peening) on a press-and-sinter 7xxx series aluminum powder metallurgy (PM) alloy. The characterization of the products was completed through a combination of non-contact surface profiling, hardness measurements, differential scanning calorimetry (DSC), transmission electron microscopy (TEM), X-ray diffraction (XRD), tensile, and three-point bend fatigue testing. It was determined that sizing in the as-quenched state imparted appreciable reductions in surface hardness (78 HRB) and fatigue strength (168 MPa) relative to counterpart specimens that were sized prior to solutionizing (85 HRB and 228 MPa). These declines in performance were ascribed to the annihilation of quenched in vacancies that subsequently altered the nature of precipitates within the finished product. The system responded well to shot peening, as this process increased fatigue strength to 294 MPa. However, thermal exposure at 353 K (80 • C) and 433 K (160 • C) then reduced fatigue performance to 260 MPa and 173 MPa, respectively, as a result of residual stress relaxation and in-situ over-aging.

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Section: Effects Of Shot Peeningmentioning

confidence: 99%

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

Harding

Donaldson²,

Hexemer³

et al. 2017

Metals

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“…As energy shortages and environmental pollution become increasingly serious, there is an increasing desire for lightweight materials that can provide energy savings and environmental protection in the automobile industry. One option that has become progressively more attractive is that of aluminum powder metallurgy (PM) [1]. A uniform microstructure is difficult to achieve by conventional die casting techniques because of the limited solubility of transition metals (TMS), such as Cr, Fe, Ti, and Zr in the Al matrix and the low cooling rate during solidification.…”

Section: Introductionmentioning

confidence: 99%

Effects of Compaction Velocity on the Sinterability of Al-Fe-Cr-Ti PM Alloy

Yuan

Yin

et al. 2019

Materials

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In this research, the effects of the compaction velocity on the sinterability of the Al–Fe–Cr–Ti powder metallurgy (PM) alloy by high velocity compaction were investigated. The Al–Fe–Cr–Ti alloy powder was compacted with different velocities by high velocity compaction and then sintered under a flow of high pure (99.999 wt%) nitrogen gas. Results indicated that both the sintered density and mechanical properties increased with increasing compaction velocity. By increasing the compaction velocity, the shrinkage of the sintered samples decreased. A maximum sintered density of 2.85 gcm−3 (relative density is 98%) was obtained when the compaction velocity was 9.4 ms−1. The radial and axial shrinkage were controlled to less than 1% at a compaction velocity of 9.4 ms−1. At a compaction velocity of 9.4 ms−1, sintered compacts with an ultimate tensile strength of 222 MPa and a yield strength of 160 MPa were achieved. The maximum elongation was observed to be 2.6%. The enhanced tensile properties of the Al–Fe–Cr–Ti alloy were mainly due to particle boundary strengthening.

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“…Iron was known due to their strength but when exposing to certain environments it will be highly corrosive material and for copper, soft characteristic has become disadvantage as well as aluminum for overpriced and not strong enough [2]. In order to mitigate this issue, alloying method was applied to mix two or more element either among metal or with non-metal (one must be metal) to form a coherent mass known as alloy [3]. The structure of alloy consists of the base metal (major constituent) and the alloying elements (metal or non-metal) commonly in a small quantity to form the product based on the desire properties.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Effect of Sintering Temperature and Holding Time to the Characteristics of Fecual Powder Compacts Formed at Elevated Temperature

Rahman¹,

Ismail

Rahman

2018

IJET

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This paper presents the experimental investigation on the effect of sintering schedule to the final properties of FeCuAl powder compacts formed at elevated temperature through a lab-scale uniaxial die compaction rig. Iron (Fe) powder ASC100.29 was used as a main powder constituent and mixed with elemental powders which are copper (Cu) and aluminum (Al). The weight percentage of powder mass was divided into four, i.e., iron (91.7 wt%), copper (7.5 wt%), aluminum (0.5 wt%), and zinc stearate (0.3 wt%) as lubricant. All the powders were mixed through mechanical blending at a rotation speed of 30 rpm for 30 min. The mixed powder mass was compacted at 150˚C by 425 MPa of axial loading from upward and downward simultaneously. Subsequently, the defect-free green compacts were sintered under controlled argon gas atmosphere at three different sintering temperatures, i.e., 800˚C, 900˚C and 1000˚C for 120 min, 150 min and 180 min, respectively at constant sintering rate of 10˚C/min. Afterwards, the sintered samples were characterized for their physical properties, electrical properties, mechanical properties and their microstructures were evaluated. The results revealed that higher flexure stress was acquired by sample sintered at 1000˚C for 120 min and their microstructures were found to be better, i.e., the particles were bonded perfectly.

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Characterization of the microstructure, mechanical properties, and shot peening response of an industrially processed Al–Zn–Mg–Cu PM alloy

Cited by 23 publications

References 20 publications

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

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

Effects of Compaction Velocity on the Sinterability of Al-Fe-Cr-Ti PM Alloy

An Experimental Investigation on the Effect of Sintering Temperature and Holding Time to the Characteristics of Fecual Powder Compacts Formed at Elevated Temperature

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