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Paper Information

Journal:   IRANIAN JOURNAL OF MATERIALS SCIENCE AND ENGINEERING   MARCH 2014 , Volume 11 , Number 1; Page(s) 17 To 26.
 
Paper: 

EFFECT OF CONTROLLED QUENCHING ON THE AGING OF 2024 ALUMINUM ALLOY CONTAINING BORON

 
 
Author(s):  KHATAMI N.*, MIRDAMADI SH.
 
* SCHOOL OF METALLURGY AND MATERIALS ENGINEERING, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

The presence r! f alloying elements, sometimes in a very small amount, affects mechanical properties; one r!f these elements is Boron. In Aluminum industries, Boron master alloy is widely used as a grain refiner In this research, the production process of Aluminum Boron master alloy was studied at first; then, it was concurrently added to 2024 Aluminum alloy. After rolling and homogenizing the resulting alloy, the optimal temperature and time of aging were determined during the precipitation hardening heat treatment by controlled quenching (T6C). Then, in order to find the effect of controlled quenching, different cycles of heat treatment including precipitation heat treatment by controlled quenching (T6C) and conventional quenching (T6) were applied on the alloy at the aging temperature of 110oC. Mechanical properties of the resulting alloy were evaluated after aging at optimum temperature rif 110°C by performing mechanical tests including hardness and tensile tests. The results ofhardness test showed that applying the controlled quenching instead of conventional quenching in precipitation heat treatment caused reduction in the time of reaching the maximum hardness and also increase in hardness rate due to the generated thermo-elastic stresses rather than hydrostatic stresses and increased atomic dijji1sion coefficient as well. Tensile test results demonstrated that, due to the presence of horide particles in the microstructure of the present alloy, the ultimate tensile strength in the specimens containing Boron additive increased by 3.40% in comparison with the specimens without such an addiiive and elongation (percentage of relative length increase) which approximately increased by 38.80% due to the role of Boron in the increase of alloy ductility.

 
Keyword(s): ALUMINUM BORON MASTER ALLOY, 2024 ALUMINUM ALLOY, PRECIPITATION HARDENING HEAT TREATMENT, CONTROLLED QUENCHING, THERMO-ELASTIC STRESS, THERMOSTATIC STRESS
 
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