Synergy Effect of Bi Addition, Cooling Condition and Artificial Aging on Performance of Al-8Si-0. 3Mg Cast Alloy

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FARAHANY SAEED

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Journal: FOUNDING RESEARCH JOURNAL Year:2018 | Volume:2 | Issue:3 Page(s): 147-160

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Title

Synergy Effect of Bi Addition, Cooling Condition and Artificial Aging on Performance of Al-8Si-0. 3Mg Cast Alloy

Author(s)

FARAHANY SAEED | Issue Writer Certificate

Keywords

Aluminium

Modification

Bismuth

Heat treatment

Mechanical properties

Abstract

In this paper, synergy effect of various Bismuth contents and cooling rates on performance of Al-8Si-0. 3Mg cast alloy after applying T6 Heat treatment was evaluated. Cooling rate was measured based on analyzing cooling curve and its second derivative curve. A step mould with different casting thicknesses was designed to obtain four different cooling rates (0. 55 to 6 ° C/s). Microstructures of sample were evaluated by optical microscopy and scanning electron microscopy (SEM). Results showed that sample modified with Bi and solidified at higher cooling rate required less time for annealing and spherodising of eutectic silicon. Moreover, tensile test results indicated that the highest yield strength (142. 2 MPa), ultimate tensile strength (235 MPa) and elongation percentage (6. 1%) obtained for the sample containing 0. 5 wt% Bi and solidified at the highest cooling rate (6 ° C/s). Fracture surface of samples cooled at low cooling rate comprised of cleavage indicating brittle fracture mode resulted in low ductility. Likewise, fracture surface of samples solidified at highest cooling rate exhibits dimples and ductile fracture mode. The counter graph of quality index used to predict the quality of heat-treated samples with different levels of Bi and solidified at various cooling rates showed that the highest index (352. 8 MPa) obtained for specimen containing 0. 5wt% Bi solidified at 6 ° C/s cooling rate.

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APA: Copy

FARAHANY, SAEED. (2018). Synergy Effect of Bi Addition, Cooling Condition and Artificial Aging on Performance of Al-8Si-0. 3Mg Cast Alloy. FOUNDING RESEARCH JOURNAL, 2(3 ), 147-160. SID. https://sid.ir/paper/265694/en

Vancouver: Copy

FARAHANY SAEED. Synergy Effect of Bi Addition, Cooling Condition and Artificial Aging on Performance of Al-8Si-0. 3Mg Cast Alloy. FOUNDING RESEARCH JOURNAL[Internet]. 2018;2(3 ):147-160. Available from: https://sid.ir/paper/265694/en

IEEE: Copy

SAEED FARAHANY, “Synergy Effect of Bi Addition, Cooling Condition and Artificial Aging on Performance of Al-8Si-0. 3Mg Cast Alloy,” FOUNDING RESEARCH JOURNAL, vol. 2, no. 3 , pp. 147–160, 2018, [Online]. Available: https://sid.ir/paper/265694/en

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