Development of the cryogenic processing cycle for age hardenable AA7075 aluminium alloy and optimization of the process for surface quality using gray relational analysis

Khedekar, D. S.; Gogte, C. L.

doi:10.1016/j.matpr.2017.12.077

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…There is some limited research on non-ferrous alloys, but even these are mostly related to aluminum alloys used or related to the tooling industry. The study of non-ferrous alloys (Al-, Ni-, and Ti-based alloys) showed the improvement of mechanical properties [352][353][354][355][356][357][358] such as microhardness [352,354,[359][360][361], fatigue [352], fracture toughness [362,363], impact toughness [352], and tensile strength [352,354].…”

Section: Energy Sector and Position Of Cryogenic Treatmentsmentioning

confidence: 99%

Sustainable New Technology for the Improvement of Metallic Materials for Future Energy Applications

Jovičević-Klug,

Rohwerder

2023

Coatings

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The need for a more sustainable and accessible source of energy is increasing as human society advances. The use of different metallic materials and their challenges in current and future energy sectors are the primary focus of the first part of this review. Cryogenic treatment (CT), one of the possible solutions for an environmentally friendly, sustainable, and cost-effective technology for tailoring the properties of these materials, is the focus of second part of the review. CT was found to have great potential for the improvement of the properties of metallic materials and the extension of their service life. The focus of the review is on selected surface properties and corrosion resistance, which are under-researched and have great potential for future research and application of CT in the energy sector. Most research reports that CT improves corrosion resistance by up to 90%. This is based on the unique oxide formation that can provide corrosion protection and extend the life of metallic materials by up to three times. However, more research should be conducted on the surface resistance and corrosion resistance of metallic materials in future studies to provide standards for the application of CT in the energy sector.

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Section: Energy Sector and Position Of Cryogenic Treatmentsmentioning

confidence: 99%

Sustainable New Technology for the Improvement of Metallic Materials for Future Energy Applications

Jovičević-Klug,

Rohwerder

2023

Coatings

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“…The hardness has been increased by 13 %, and the wear resistance has been increased after deep cryogenic treatment. [12] have been processing and optimizing the treatment parameters for getting the best combination of hardness and surface roughness after the cryogenic treatment of 7075 aluminum alloy, with the effect of the soaking period on this alloy, using design of experiments by Taguchi and optimization by gray relational analysis. [13] have been using Al alloy (Zn-Mg-Cu) treated by (DCT) to investigate the changes in the microstructure to improving the mechanical properties.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development mechanical and fatigue properties of AA7001 after combined SP with deep cryogenic treatment and UIP with deep cryogenic treatment

Alhamdany

Khenyab

Mohammed

et al. 2021

EEJET

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Al alloys have long been of interest to the aerospace community, due to their modest specific strength, ease of manufacture, and low cost. In recent years, with the rapid development of weaponry, 7XXX ultra-high strength aluminum alloys used increasingly in military ﬁelds. Chemical analysis of the AA 7001 is supported out at The Company State for Engineering, Rehabilitation and Inspection (SIER) in Iraq. Strengthening the surface (shot penning) is beneficial to delay crack nucleation and extend life. The test samples (tensile and fatigue) are subject to the SP process by using ball steel with the parameters (Pressure=12 bars, Speed=40 mm/min, Distance=150 mm, Shot size=2.25 mm, Coverage=100 %). The ultrasonic impact treatment (UIP) machine is used for enhancing the surface properties. For the Deep Cryogenic Treatment (DCT), the samples have been placed in the cooling chamber. A standard tensile test specimen is prepared in a round section with the dimensions chosen according to ASTM (A370-11). Tensile and fatigue of rotating bending with R=–1 have been conducting, after the effect of deep cryogenic treatment (DCT), combined shot peening (SP+DCT), and ultrasonic impact peening (UIP+DCT) of AA7001 have been examining. The maximum improvement percent in ultimate tensile strength (UTS) due to (DCT), (SP+DCT), and (UIP+DCT) were about 3 %, 8.27 %, and 6.25 %, respectively. The rise in the yield stress due to (DCT), (SP+DCT), and (UIP+DCT) were 9.5 %, 14.6 %, and 13.14 %, respectively. The ductility reduced by constituents of 8.57 %, 12.5 %, and 11.42 % sequentially. The improvement in fatigue strength in a high cycle regime is 16 % for (SP+DCT) due to combined effects, it is an 8 % increase in the endurance limit on fatigue behavior due to inducing compressive residual stress (CRS)

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“…They are generally utilized in the hardened (T6) condition. They are used in applications like aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, and keys [4]. Duralumin (Al2024) has an excellent combination of machining characteristics, fatigue resistance, and tensile strength among other Al-Cu alloys [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of weight of reinforcement and coating thickness on the hardness of stir cast AL7075-nickel coated duralumin powder mmc

Karthik¹,

Sharma²,

Gowrishankar³

et al. 2022

J Appl Eng Science

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In the present work, it is experimented to reinforce duralumin powder (3 to 7 wt %.) into Al7075 matrix by stir casting technique. Since matrix and reinforcement both have almost similar melting temperatures, the least expensive additive manufacturing metallurgical route seems to be the best fit. In this study, an effort was made to produce the Al7075 matrix composite reinforced with duralumin by a novel stir casting method by coating duralumin powders with nickel which has high temperature melting point compared to reinforcement material.. Nickel has good wettability and avoids undesirable chemical reactions between the reinforcement and matrix at higher temperatures, acting as a protector for both the duralumin and matrix. Since, aging kinetics of duralumin (Al2024) and Al7075 are different, both positively respond to heat treatment in a single stretch for property alteration. During stir casting, even though duralumin melts along with the matrix, it will be under the solid protection barrier (coat) of nickel, avoiding dissolution with the Al7075 matrix. To verify the presence of reinforcement duralumin in the matrix and to decide the soundness of the casting produced by stir casting, confirmation tests are made like microstructures with EDS and microhardness distribution. The microstructure analysis of the composite showed an even distribution of nickel coated duralumin in the matrix when the coating thickness of a nickel is greater than 8 µm. The hardness test analysis has shown an improvement in the hardness with the increase in the weight % of the reinforcement. Improvement in the hardness of composites is due to an increase in dislocation number, which shows higher resistance to plastic deformation [2]. Statistical analysis has shown that the coating of reinforcement does not have any significant effect on the mechanical properties. The regression equation is fit to determine the hardness of the composite involving the factors within the range of values considered for this study.

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Development of the cryogenic processing cycle for age hardenable AA7075 aluminium alloy and optimization of the process for surface quality using gray relational analysis

Cited by 6 publications

References 2 publications

Sustainable New Technology for the Improvement of Metallic Materials for Future Energy Applications

Sustainable New Technology for the Improvement of Metallic Materials for Future Energy Applications

Development mechanical and fatigue properties of AA7001 after combined SP with deep cryogenic treatment and UIP with deep cryogenic treatment

Effect of weight of reinforcement and coating thickness on the hardness of stir cast AL7075-nickel coated duralumin powder mmc

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