Influence of cryogenic treatment on hardness, tensile properties, and microstructure of aluminum alloy AA6061

Madhloom, Marwan Abbas; Ataiwi, Ali H.; Dawood, Jamal Jalal

doi:10.1016/j.matpr.2022.02.131

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The interaction of these two factors increased the yield strength of the alloy from 391.4 MPa to 472.7 MPa after DCT1h, significantly improving the mechanical properties of the alloy. Marwan Abbas Madhloom et al [18] studied the effect of cryogenic treatment on the microstructure and mechanical properties of 6061 aluminum alloy. The results showed that the hardness of the alloy increased from 64 HV to 74 HV after cryogenic treatment, and both the tensile strength and yield strength increased to different degrees.…”

Section: Introductionmentioning

confidence: 99%

Effect on microstructure and mechanical properties of friction stir welded 5A06 aluminum alloy joints by deep cryogenic treatment

Du,

Qiao,

Wang

et al. 2024

Mater. Res. Express

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In order to improve the comprehensive mechanical properties of the welded joints of the 5A06 aluminum alloy, friction stir welded (FSW) joints were subjected to deep cryogenic treatment (DCT). The microstructure and mechanical properties were characterised using metallographic microscopy, X-ray diffractometer (XRD), energy spectrometer, microhardness tests, and tensile tests. The experimental results show that DCT refines the structure significantly due to the large temperature difference. This refinement results from an increase in Mg atoms within the α-Al solid solution through the precipitation of Al atoms, forming the Al3Mg2 phase. This enhancement in plasticity is achieved through dispersion distribution. Moreover, as the treatment time of DCT increases, the mechanical properties of the welded joint also improve significantly. With an extended treatment time of DCT, the microhardness of the welded joints reaches its peak, leading to an average microhardness increase of up to 6.9% compared to welded joints without DCT. Additionally, the tensile properties of the welded joints reach 385.3MPa, marking a 7.4% increase in tensile strength compared to joints without DCT. These experimental results underscore the significant impact of DCT on improving the welded joints.

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Section: Introductionmentioning

confidence: 99%

Effect on microstructure and mechanical properties of friction stir welded 5A06 aluminum alloy joints by deep cryogenic treatment

Du,

Qiao,

Wang

et al. 2024

Mater. Res. Express

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show abstract

“…They found that samples treated with deep cryogenic treatment for 6 h had the highest fatigue life, with the formation of Mg 2 Si leading to an increase in fatigue performance and hardness. Madhloom et al [23] treated AA6061 alloy at −196 • C for 24 h, and the results showed a significant increase in the alloy's tensile strength. The uniformly distributed Mg 2 Si precipitate phases were the main reason for the strengthening effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deep Cryogenic Treatment on the Artificial Aging Behavior of 6082 Aluminum Alloy

Qiu,

Tang,

Tian

et al. 2024

Coatings

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This study investigates the impact of cryogenic treatment duration on the mechanical properties and microstructural evolution of 6082 aluminum alloy subjected to subsequent artificial aging. Tensile tests were conducted using an electronic universal testing machine, and the microstructure was characterized by employing optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that both the tensile strength and elongation of the alloy first increase and then decrease with the extension of cryogenic treatment duration. The alloy treated with 12 h of cryogenic treatment followed by artificial aging at 180 °C for 8 h achieved a peak strength of 390 MPa. Meanwhile, the alloy treated with 8 h of cryogenic treatment and the same artificial aging process reached a maximum elongation of 13%. All specimens of 6082 aluminum alloy subjected to cryogenic and aging treatments exhibited ductile fracture under room temperature tensile conditions. The size of dimples at the fracture surface first increased and then decreased with increasing cryogenic treatment duration, indicating a transition from deeper to shallower dimples. The cryogenic treatment did not significantly affect the grain size of the alloy, which remained approximately 230 µm on average. Cryogenic treatment facilitated the precipitation of fine, densely distributed precipitates, enhancing the pinning effect of dislocations and thus improving the tensile strength. Additionally, cryogenic treatment increased the dislocation density and promoted the formation of subgrains, while the grain boundary precipitates transitioned from a continuous to a discontinuous distribution, all of which contribute to the enhancement of the plasticity.

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“…Niu et al [18] studied the optimum parameters of cryogenic treatment to reduce the residual stress of 2A12 aluminum alloy, and the results showed that the residual stresses under cryogenic treatment with the optimized parameters were decreased by up to 93%. Marwan et al [19] studied the effect of cryogenic treatment on aluminum alloy AA6061, and the results shows a significant increase in hardness, tensile strength, and yield stress after cryogenic processing.…”

Section: Introductionmentioning

confidence: 99%

Study of Machined Surface Quality of AZ31B Magnesium Alloy by End Milling

Zhang,

Huang,

Wang

et al. 2023

Metals

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Magnesium alloys are lightweight structural materials with excellent machinability. However, further development is seriously limited by their low strength and poor formability. Therefore, further decreasing the surface residual stress of the frame by post-process treatment is a key issue, such as for reducing the subsequent deformation due to the residual stress, improving the machining accuracy and corrosion resistance of the magnesium alloy frame products, and extending the service life of the magnesium alloy frame products. Using AZ31B magnesium alloy as the experimental subject, and by exploring the effects of milling parameters on the surface quality of frame parts, this study shows that the surface residual compressive stress, hardness, and roughness of frame parts decreased with the increasing of the milling speed and increased as the depth of cut and the feed per tooth increased. Using cutting fluid in the milling process can decrease the surface residual stress and roughness of the frame parts but increase the surface hardness. In accordance with the experimental results and analysis, the main reason affecting the residual stress on the surface layer of frame components is the thermal elastoplastic problem caused by thermal mechanical coupling during the milling process, resulting in varying stress states on the workpiece’s surface. The primary contributors to hardness are the work-hardening effect induced by milling forces and the thermal-softening effect of milling temperatures, which either augment or diminish the workpiece’s surface hardness. Furthermore, the primary factor impacting surface roughness is the magnitude of cutting forces. Excessive cutting forces lead to the ploughing phenomenon or tool vibrations, thereby causing varying degrees of surface roughness on the workpiece. Meanwhile, the influence of stress-relief annealing or cryogenic treatment on surface residual stress and hardness after the milling of the frame parts was researched. It shows that within the selected milling parameters, both stress-relief annealing and cryogenic treatment can reduce the surface residual stress and homogenize the residual stress distribution of frame parts. Stress-relief annealing leads to a reduction in the hardness of the machined surface, and the hardness of the machined surface increases slightly under cryogenic treatment. The effects of the two post-processing methods on surface quality vary, and in practical production, a rational selection can be made according to the different processing requirements to achieve the optimal standards.

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Influence of cryogenic treatment on hardness, tensile properties, and microstructure of aluminum alloy AA6061

Cited by 6 publications

References 6 publications

Effect on microstructure and mechanical properties of friction stir welded 5A06 aluminum alloy joints by deep cryogenic treatment

Effect on microstructure and mechanical properties of friction stir welded 5A06 aluminum alloy joints by deep cryogenic treatment

Effect of Deep Cryogenic Treatment on the Artificial Aging Behavior of 6082 Aluminum Alloy

Study of Machined Surface Quality of AZ31B Magnesium Alloy by End Milling

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