Evolution of second phases and mechanical properties of 7075 Al alloy processed by solution heat treatment

Zou, Xiuliang; Yan, Hong; Chen, Xiaohui

doi:10.1016/s1003-6326(17)60240-1

Cited by 109 publications

(39 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Single-stage aging was an effective method for improving the mechanical properties of welded joints. The improvement of the mechanical properties of the welded joint was due to the precipitation strengthening [14,15,35]. The main alloying elements (Zn, Mg, and Cu elements) in the 7075 aluminum alloy PVPPAW joint were the same as in the 7075 aluminum alloy.…”

Section: Discussionmentioning

confidence: 96%

Evolution of Microstructure and Mechanical Properties in a Single-Stage Aged 7075 Aluminum Alloy Pulse Variable Polarity Plasma Arc Welded Joint

Liang

Chen

et al. 2019

Metals

View full text Add to dashboard Cite

A 7075 aluminum alloy was successfully welded by pulsed variable polarity plasma arc welding (PVPPAW) and the single-stage aging behavior of the 7075 aluminum alloy PVPPAW joint was systematically investigated. The results demonstrated that the tensile strength of the welded joints initially increased and then decreased with the increase of the single-stage aging temperature and time. After single-stage aging at 490 °C for 80 min and at 130 °C for 24 h, the tensile strength of the welded joint was 551 MPa, which was increased by 38.5% compared to the as-welded joint. Moreover, the conductivity was 25% international annealed copper standard (IACS) at room temperature, and the resistance to stress corrosion was improved. The main strengthening phases of the weld center were η′ and η phase. The average precipitate size slightly increased with the increase of the single-stage aging temperature, but no obvious change was observed with the increase of the single-stage aging time. The area fraction was initially increased and then decreased with the increase of the single-stage aging temperature and time.

show abstract

Section: Discussionmentioning

confidence: 96%

Evolution of Microstructure and Mechanical Properties in a Single-Stage Aged 7075 Aluminum Alloy Pulse Variable Polarity Plasma Arc Welded Joint

Liang

Chen

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…After 6 h treatment at 490 • C, the sample's microstructure exhibits clear and large size grain boundaries. Nevertheless, the Al matrix exists in the insoluble phase, such as the intermetallic Al 7 Cu 2 Fe phase and S phase (Al 2 CuMg) particles, and coarse black particles (as shown by the green arrow), and then these black particles may be Mg 2 Si, which forms in temperature around 490 • C. Furthermore, coarse Mg 2 Si particles are detrimental to the strength and hardness of the alloy, because they hinder the dissolution of the solute element (such as Zn, Mg, Cu) into the matrix [23]. The raw Al-7075 alloy did not experience severe deformation, and a number of strengthening phases dissolve into the matrix, so dislocation strengthening, grain refinement strengthening and precipitation strengthening did not exist, and the only strengthening mechanism is solution strengthening.…”

Section: Microstructurementioning

confidence: 99%

Preparation of Ultrafine-Grained Continuous Chips by Cryogenic Large Strain Machining

Chen

Zhang

et al. 2020

Metals

View full text Add to dashboard Cite

Conventional orthogonal machining is an effective severe plastic deformation (SPD) method to fabricate ultrafine-grained (UFG) materials. However, UFG materials produced by room temperature-free machining (RT-FM) are prone to dynamic recovery, which decreases the mechanical properties of UFG materials. In this study, the cryogenic orthogonal machining technique was implemented to fabricate chips that have an abundant UFG microstructure. Solution-treated Al-7075 bulk has been processed in cryogenic temperature (CT) and room temperature (RT) with various machining parameters, respectively. The microstructure, chip morphology and mechanical properties of CT and RT samples have been investigated. CT samples can reach a microhardness of 167.46 Hv, and the hardness of CT samples is higher than that of the corresponding RT samples among all parameters, with an average difference of 5.62 Hv. Piecemeal chip obtained under RT has cracks on its free surface, and elevated temperature aggravates crack growth, whereas all CT samples possess smoother surfaces and continuous shape. CT suppresses dynamic recovery effectively to form a heavier deformation microstructure, and with a higher dislocation density in CT samples, they further improve the chips’ hardness. Also, CT inhibits the formation of solute cluster and precipitation to enhance the formability of material, so that continuous chips are formed.

show abstract

“…Furthermore, its ability to be highly polished makes it suitable for the mold tool manufacturing industry. The aforementioned reasons have led a number of researchers to focus their studies on these factors [13][14][15]. In this study, an Al7075 plate (150 mm × 150 mm × 15 mm) was selected for performing the experimental work.…”

Section: Selection Of Materialsmentioning

confidence: 99%

Prediction of Thrust Force and Cutting Torque in Drilling Based on the Response Surface Methodology

et al. 2018

View full text Add to dashboard Cite

In this research, experimental studies were based on drilling with solid carbide tools and the material used was Al7075. The study primarily focused on investigating the effects of machining parameters (cutting speed, feed rate, diameter of the tool) on the thrust force (F z ) and the cutting torque (M z ) when drilling an Al7075 workpiece. The experimental data were analyzed using the response surface methodology (RSM) with an aim to identify the significant factors on the development of both the F z and M z . The application of the mathematical models provided favorable results with an accuracy of 3.4% and 4.7%, for the F z and the M z , respectively. Analysis of variance (ANOVA) was applied in order to examine the effectiveness of the model, and both mathematical models were established and validated. The equations derived proved to be very precise when a set of validation tests were executed. The importance of the factors' influence over the responses was also presented. Both the diameter of the cutting and the feed rate were found to be the factors of high significance, while cutting speed did not affect considerably the F z and M z in the experiments performed.

show abstract

Evolution of second phases and mechanical properties of 7075 Al alloy processed by solution heat treatment

Cited by 109 publications

References 21 publications

Evolution of Microstructure and Mechanical Properties in a Single-Stage Aged 7075 Aluminum Alloy Pulse Variable Polarity Plasma Arc Welded Joint

Evolution of Microstructure and Mechanical Properties in a Single-Stage Aged 7075 Aluminum Alloy Pulse Variable Polarity Plasma Arc Welded Joint

Preparation of Ultrafine-Grained Continuous Chips by Cryogenic Large Strain Machining

Prediction of Thrust Force and Cutting Torque in Drilling Based on the Response Surface Methodology

Contact Info

Product

Resources

About