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Showing 4 results for Heat Treatments
THE EFFECT OF AGING TREATMENT ON MECHANICAL PROPERTIES OFAA6082 ALLOY: MODELINGAND EXPERIMENT
N. Anjabin, Karimi Taheri,
Volume 7, Issue 2 (6-2010)
Abstract

Abstract:

properties of AA6082 aluminum alloy. Considering that aging phenomenon affects the distribution of alloying element

in matrix, and the fact that different distribution of alloying elements has different impediments to dislocation

movement, a material model based on microstructure, has been developed in this research. A relative volume fraction

or mean radius of precipitations is introduced into the flow stress by using the appropriate relationships. The GA-based

optimization technique is used to evaluate the material constants within the equations from the uni-axial tensile test

data of AA6082 alloy. Finally, using the proposed model with optimized constants, the flow behavior of the alloy at

different conditions of heat treatment is predicted. The results predicted by the model showed a good agreement with

experimental data, indicating the capability of the model in prediction of the material flow behavior after different heat

treatment cycles. Also, the calculated flow stress was used for determination of the material property in Abaqus

Software to analyze the uniaxial compression test. The force- displacement curves of the analysis were compared to

the experimental data obtained in the same condition, and a good agreement was found between the two sets of results.

A novel constitutive equation has been proposed to predict the effect of aging treatment on mechanical
MULLITE SYNTHESIS AND FORMATION FROM KYANITE CONCENTRATES IN DIFFERENT CONDITIONS OF HEAT TREATMENT AND PARTICLE SIZE
A. Namiranian , M. Kalantar,
Volume 8, Issue 3 (9-2011)
Abstract
The process of mullitization of kyanite concentrate was studied at different conditions of heat treatment (1400
– 1600 °C and 0.5 – 3.5 hours) and particle size of raw materials (38-300 ?m). Kyanite concentrate was obtained from
ore-dressing of kyanite deposits of Mishidowan-Bafgh region at 100 km northeastern part of Yazd. The results of
microstructure (shape, distribution and size of the grains) and phase evolution studies by SEM and XRD showed that
total transformation of kyanite to mullite takes place by heat treatment between 1500 –1550 °C during 2.5 hours.. At
temperatures below 1500 °C need-like mullite grains are always produced. At higher temperatures the mullite grains
reveal rounded and platelet morphology. At 1550 °C, the rate of mullitization and densification were improved by
increasing soaking time from 1h to 3h and decreasing particle size of materials from 300 to 38 m
EFFECTS OF Al-5TI-1B MASTER ALLOY AND HEAT TREATMENT ON THE MICROSTRUCTURE AND DRY SLIDING WEAR BEHAVIOR OF AN Al-12Zn-3Mg-2.5Cu ALLOY
M. Alipour, S. Mirjavadi, M. K. Besharati Givi, H. Razmi, M. Emamy, J. Rassizadehghani,
Volume 9, Issue 4 (12-2012)
Abstract
In this study the effect of Al–5Ti–1B grain refiner on the structural characteristics and wear properties of Al–12Zn–3Mg–2.5Cu alloy was investigated. The optimum amount for Ti containing grain refiners was selected as 2 wt.%. T6 heat treatment, (i.e. heating at 460 °C for 1 h before water quenching to room temperature and then aging at 120 °C for 24 h) was applied for all specimens before wear testing. Dry sliding wear resistant of the alloy was performed under normal atmospheric conditions. The experimental results showed that the T6 heat treatment considerably improved the resistance of Al–12Zn–3Mg–2.5Cu alloy to dry sliding wear.
EFFECTS OF A MODIFIED SIMA PROCESS ON THE STRUCTURE, HARDNESS AND MECHANICAL PROPERTIES OF Al-12Zn-3Mg-2.5Cu ALLOY
M. Alipour, M. Emami, R. Eslami Farsania, M. H. Siadati, H. Khorsand,
Volume 12, Issue 4 (12-2015)
Abstract

A modified strain-induced melt activation (SIMA) process was applied and its effect on the structural characteristics and hardness of the aluminum alloy Al–12Zn–3Mg–2.5Cu was investigated. Specimens subjected to a deformation of 40% at 300 °C were heat treated at various times (10-40 min) and temperatures (550-600 °C). Microstructural studies were carried out using optical and scanning electron microscopies (SEM). Results showed that the best microstructure was obtained at the temperature and time of 575 °C and 20 min, respectively. The hardness test results revealed superior hardness in comparison with the samples prepared without the application of the modified SIMA process.

T6 heat treatment including quenching to 25 °C and aging at 120 °C for 24 h was employed to reach to the maximum strength. After the T6 heat treatment, the average tensile strength increased from 231 MPa to 487 and 215 MPa to 462 for samples before and after strain-induced melt activation process, respectively. Ultimate strength of globular microstructure specimens after SIMA process has a lower value than as-cast specimens without SIMA process


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