The influence of flame hardening process to aluminum 7075 series on the mechanical strength and micro structure

The 7075 series alloys are heat treatable wrought aluminum alloys based on the Al−Zn−Mg(−Cu) system. They are widely used in high-performance structural aerospace and transportation applications. Apart from compositional, casting and thermo-mechanical processing effects, the balance of properties is...

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Bibliographic Details
Main Authors: Koin, Sudibtia Titio, Triyono, Teguh, Surojo, Eko
Format: Conference Proceeding
Language:English
Subjects:
Aging (artificial)
Alloy systems
Aluminum alloys
Aluminum base alloys
Copper
Flame hardening
Hardness
Heat
Machining
Magnesium
Microstructure
Properties (attributes)
Solution heat treatment
Tensile strength
Thermomechanical treatment
Transportation applications
Zinc
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Summary:The 7075 series alloys are heat treatable wrought aluminum alloys based on the Al−Zn−Mg(−Cu) system. They are widely used in high-performance structural aerospace and transportation applications. Apart from compositional, casting and thermo-mechanical processing effects, the balance of properties is also significantly influenced by the way in which the materials are heat-treated. This paper describes the effect of flame hardening process to aluminum 7075 series on the increasing hardness, tensile strength, and evolution of microstructure. A test specimen had made by machining process and flame heating. Temperature of solution heat treatment is varied on 350 °C, 400 °C, 450 °C and 500 °C. After that process a test specimen would be quenched at nitrate-nitrite liquid during 45 minutes and artificial aging at 120°C until two days. The testing specimen consist of hardness and tensile strength according to ASTM. The result showed that specimen had precipitation on microstructure lead to an increase in aluminum properties. On the temperature 450°C solution heat treatment, the aluminum properties reached the highest value, namely, hardness of 129 HVN and tensile strength 570 MPa.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5024116