Intercrystalline fracture of precipitation-hardening aluminum alloys

1967 ◽  
Vol 9 (6) ◽  
pp. 427-429
Author(s):  
I. F. Afonskii ◽  
A. I. Korchagin
Keyword(s):  
Aluminum Alloys ◽  
Precipitation Hardening ◽  
Intercrystalline Fracture

Age-Hardening Response of Mg-Al-Sn Alloys

2015 ◽  
Vol 828-829 ◽  
pp. 250-255
Author(s):  
Abu Syed Humaun Kabir ◽  
Jing Su ◽  
Mehdi Sanjari ◽  
In Ho Jung ◽  
Stephen Yue
Keyword(s):  
Electron Microscope ◽  
Aluminum Alloys ◽  
Scanning Electron Microscope ◽  
Magnesium Alloys ◽  
Isothermal Aging ◽  
Precipitation Hardening ◽  
Metallic Alloys ◽  
Mg Alloys ◽  
Age Hardening ◽  
Scanning Electron

Precipitation hardening has been used before as one of the most effective strengthening methods for many metallic alloys. However, this method has not been studied completely in magnesium alloys, and the numbers of precipitation hardenable wrought Mg alloys are still very limited compared to aluminum alloys and steels. The age hardening responses of Mg-Al-Sn alloys in cast-homogenized condition were investigated by isothermal aging at 200°C for prolonged time. It was found that hardness can be improved significantly for the alloy with higher amounts of tin. The improvement in hardness was reasoned by the formation of precipitates. The shapes and morphology of the precipitates were different depending on the orientations of the grains. The precipitates were characterized by scanning electron microscope.

A Study on Thermal Conductivity and Mechanical Properties of Al-Zn-Mg Aluminum Alloys

2012 ◽  
Vol 724 ◽  
pp. 169-172
Author(s):  
Je Sik Shin ◽  
Se Hyun Ko ◽  
Ki Tae Kim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Precipitation Hardening ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
High Electrical Conductivity ◽  
Conductivity Loss

In this paper, it was aimed to develop a new Al-Zn-Mg base aluminum alloy having high electrical conductivity, strength, and formability simultaneously. As a result, Al-Zn-Mg base low aluminum alloy sheet can be effectively strengthened without significant thermal conductivity loss by multiply alloying precipitation hardening elements and properly controlling production process parameters.

Improving the mechanical properties and reducing the residual stresses of AA7075 by combination of cyclic close die forging and precipitation hardening

2020 ◽  
pp. 146442072097242
Author(s):  
MA Moazam ◽  
M Honarpisheh
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Aluminum Alloys ◽  
Tensile Stress ◽  
Residual Stresses ◽  
Precipitation Hardening ◽  
Stress Measurement ◽  
Uniaxial Tensile ◽  
Die Forging ◽  
Aa 7075

As one of the major strengthening mechanisms, the precipitation hardening is used to enhance the mechanical properties of aluminum alloys. Based on the results of the residual stress measurement, after fast quenching, the core of the material is under tensile stress while the surfaces are under compressive residual stress. Distortion commonly happens during the machining of precipitation-hardened aluminum alloys due to the residual stresses created during the quenching step in the heat treatment process. In this study, the combination of cyclic close die forging and precipitation hardening was used to improve the mechanical properties and control the residual stresses of AA 7075, simultaneously. According to the results, a considerable level of residual stresses was developed in the sample after the quenching step. Performing the cyclic close die forging process immediately after the quenching step changed the pattern of the residual stresses and reduced them significantly. The reduction of the residual stresses after the first pass of cyclic close die forging was about 50%, while after two passes, the sample was almost fully stress relieved. Besides, the results of the microhardness and uniaxial tensile tests demonstrated the improvement of the mechanical properties of the processed samples when compared to the T6 condition. Also, in comparison to AA 7075-T6, the yield stress, ultimate tensile stress, and microhardness were increased by about 24%, 22%, and 48%, respectively.

Heat Treatment of Aluminum Castings

2004 ◽  
pp. 61-68
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloys ◽  
Residual Stresses ◽  
Physical Properties ◽  
Dimensional Stability ◽  
Solution Heat Treatment ◽  
Precipitation Hardening ◽  
Heat Treating ◽  
Aluminum Castings ◽  
Mechanical And Physical Properties

Abstract The metallurgy of aluminum and its alloys offers a range of opportunities for employing heat treatments to obtain desirable combinations of mechanical and physical properties such that castings meet defined temper requirements. This chapter discusses the processes involved in solution heat treatment, quenching, precipitation hardening, and annealing of aluminum alloys. The effects of these processes on dimensional stability and residual stresses are also discussed. Troubleshooting and diagnosis of heat treating problems are covered in the concluding section of the chapter.

scholarly journals EFFECT OF PRECIPITATION HARDENING ON CORROSION BEHAVIOR FOR ALUMINUM ALLOYS 2024 AND 6061 IN 0.5M HCL

2021 ◽  
Vol 25 (Special) ◽  
pp. 2-39-2-48
Author(s):  
Saraa M. Mohammed ◽  
◽  
Sahib M. Mahdi ◽  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Corrosion Behavior ◽  
Room Temperature ◽  
Precipitation Hardening ◽  
Solution Treatment ◽  
Cyclic Polarization ◽  
Before And After ◽  
Aa 2024

The corrosion behavior of both AA 2024 and AA 6061 aluminum alloys in 0.5M HCl before and after solution treatment at room temperature (25 oC) was investigated in this paper to know the effect of the solution heat treatment on the corrᴏsion behavior of both 2024 and 606 aluminum alloys. Using the cyclic polarization test, the corrosion resistance of AA 2024 aircraft aluminum alloy decreases after solution treatment at 495 oC for 2hr from (9.490×10-3 mm/y) to (1.309×10-3 mm/y), while the corrosion resistance of AA6061 aircraft aluminum alloy decreases after solution treatment at 530 oC for 2hr from (886.3× 10-3 mm/y) to (1.270×10-3 mm/y). Pitting corrosion was the prevalent type of corrosion for both alloys.

AA 6351

Alloy Digest ◽  
1991 ◽  
Vol 40 (9) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Aluminum Alloys ◽  
Physical Properties ◽  
Tensile Properties ◽  
Precipitation Hardening ◽  
Heat Treating

Abstract AA 6351 wrought alloy contains silicon and magnesium in such amounts that Mg2Si is present as the precipitation hardening constituent with proper heat treatment. The 6000 series alloys are less strong than most of the 2000 and 7000 series aluminum alloys. The formability and corrosion resistance of AA 6351 are good. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-319. Producer or source: Various aluminum companies.

Sign in / Sign up

Export Citation Format

Share Document