Effect of Secondary Aging Process on the Structure and Properties of 7050 Aluminum Alloy Forging

2020 ◽  
Vol 861 ◽  
pp. 57-64
Author(s):  
Wei Wei He ◽  
Min Hao ◽  
Hui Qu Li ◽  
Liang Wang ◽  
Jun Zhou Chen
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Aging Time ◽  
Aging Process ◽  
Fracture Mechanisms ◽  
Second Stage ◽  
7050 Aluminum Alloy ◽  
Stress Corrosion Resistance ◽  
Precipitation Phase

The effect of the second-stage aging process on the tensile properties, fracture toughness and electrical conductivity of 7050 aluminum alloy die forgings was studied, and the mechanism of strengthening and toughening was analyzed by transmission electron microscope and scanning electron microscope. The results show that with the extension of the second-stage aging time, the morphology of the precipitation phase remains unchanged, but the average radius of the precipitation phase and the distance between each other gradually increase. The fracture modes at this aging temperature are mixed fracture mechanisms of dimple fracture and intergranular fracture, and the number of dimple fractures increases with time. With the extension of the second-stage aging time, the strength of the alloy decreases, and the fracture toughness and stress corrosion resistance increase. The alloys heat-treated at 120°C×6 h +177°C×6~8 h two-stage aging process have excellent comprehensive properties.

Study on Two-Step Aging Technology of 6082 Aluminum Bumper

2018 ◽  
Vol 764 ◽  
pp. 245-251
Author(s):  
Bei Ming Zhao ◽  
Miao Hu ◽  
Jun Zhu ◽  
Zhen Yu Han ◽  
Hou Qing Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Process Parameters ◽  
Aging Temperature ◽  
Aging Process ◽  
Production Efficiency ◽  
Holding Time ◽  
Second Stage ◽  
Main Factors ◽  
6082 Aluminum Alloy

The influence of four parameters of two-step aging on the mechanical properties of 6082 aluminum alloy bumper was studied by orthogonal test. The results show that compared with the single stage aging, the two-step aging process can reduce the aging time and improve the production efficiency under the premise of the mechanical properties of the bumper meet the requirements. Among the four aging process parameters, the second stage aging temperature and holding time are the main factors that affect the final results, while the first stage aging temperature and holding time are secondary factors. The most suitable aging process parameters for the 6082 aluminum alloy bumper is (150 °C, 2 h) + (190 °C, 2.5 h). After two-step aging, the grain of the aluminum bumper is small and evenly distributed, leading to good mechanical properties. The generalized experiment shows that the application of the two-step aging process still has some limitations and needs to be further optimized and perfected.

Analysis of Notch Effect in Fracture Micromechanisms

2012 ◽  
Author(s):  
Sergio Cicero ◽  
Virginia Madrazo ◽  
Isidro Carrascal ◽  
Roman Cicero
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Critical Radius ◽  
High Strength ◽  
Fracture Mechanisms ◽  
Notch Effect ◽  
Progressive Change ◽  
Load Bearing Capacity ◽  
Notched Specimens ◽  
Apparent Fracture Toughness

This paper presents an analysis of the notch effect in fracture micromechanisms. To this end, experimental results obtained in notched specimens are presented, together with the corresponding stress field at fracture and the SEM fractographies. The specimens comprise three materials (structural steel S275JR, high-strength aluminum alloy Al7075-T651 and Polymethyl methacrylate-PMMA) and notch radii varying from 0 mm (cracks) up to 2.5 mm. The results show how the stress relaxation caused by the notch effect is accompanied by a progressive change in the fracture mechanisms, from basically brittle ones in cracked conditions (for the three materials analyzed) to non-linear mechanisms observed for high notch radii, which explain the increase caused by the notch effect in both the load bearing capacity and the apparent fracture toughness. Also the concept of critical radius, that one below which the notch effect is negligible, is justified by SEM observations.

Indentation technique for estimating the fracture toughness of 7050 aluminum alloy with the Berkovich indenter

2012 ◽  
Vol 40 ◽  
pp. 176-184 ◽  
Author(s):  
Jiang Li ◽  
Fuguo Li ◽  
Min He ◽  
Fengmei Xue ◽  
Mingjie Zhang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Berkovich Indenter ◽  
Indentation Technique ◽  
7050 Aluminum Alloy

Effect of Cold Deformation on Precipitation of 7050 Aluminum Alloy during Aging Process

2015 ◽  
Vol 1120-1121 ◽  
pp. 1014-1018
Author(s):  
Hong Wei Yan ◽  
Liang Zhen ◽  
Jian Tang Jiang
Keyword(s):  
Electron Microscopy ◽  
Aluminum Alloy ◽  
Aging Process ◽  
Cold Deformation ◽  
Research Topic ◽  
Strengthening Mechanisms ◽  
Scanning Calorimetry ◽  
Main Research ◽  
Transmission Electron ◽  
7050 Aluminum Alloy

Strengthening of aluminum alloy has always been an interesting research topic. There might be interactions between different strengthening mechanisms. In this paper, the effect of large cold deformation on the precipitation of as-quenched 7050 aluminum alloy was studied. Differential scanning calorimetry was used as the main research technique, accompanied by tensile test and transmission electron microscopy. It was found that clusters and precipitation had formed in the cold deformation, and dislocations accelerated the precipitation dynamics.

Effect of Two-Step Aging Process on Microstructure and Fracture Toughness of 7085 Aluminum Alloy

2016 ◽  
Vol 852 ◽  
pp. 149-155
Author(s):  
Yang Song ◽  
Bai Qing Xiong ◽  
Yong An Zhang ◽  
Xi Wu Li ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Aging Process ◽  
Treatment Time ◽  
Aging Treatment ◽  
Free Zone ◽  
Intergranular Failure ◽  
Transmission Electron ◽  
Fracture Morphologies

In this paper, the effect of two-step aging treatment on microstructure and fracture toughness of 7085 aluminum alloy were investigated by using tear tests to carry out the fracture toughness tests of the alloy and using optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to analyze the microstructure. The results showed the main precipitates in the alloy were GP zones and η' phases in the grains after 118°C/6h aging treatment. With further secondary aging treatment, grain boundaries precipitates (GBPs) grew up, and the precipitate-free zone (PFZ) showed up, the increasing proportion of intergranular failure was occurred and the fracture toughness decreased. With further prolonging of the secondary aging treatment time, precipitates in the grains tended to be coarser, the GBPs became discontinuous ,PFZ became wider, and there were decreasing proportion of the intergranular failure and increasing proportion of the transgranular failure showing on the fracture morphologies, the fracture toughness of 7085 aluminum alloy increased.

ALUMINUM X7005

Alloy Digest ◽  
1966 ◽  
Vol 15 (1) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Heat Treating ◽  
Aluminum Company ◽  
Stress Corrosion Resistance

Abstract Aluminum X7005 is an age-hardenable aluminum alloy having high mechanical properties, good fracture toughness, good corrosion and stress-corrosion resistance, and good weldability. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-151. Producer or source: Aluminum Company of America.

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