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자료유형
학술저널
저자정보
강연지 (인하대학교) 윤상일 (삼기오토모티브) 김동현 (삼기오토모티브) 이기안 (인하대학교)
저널정보
한국소성·가공학회 소성·가공 소성가공 제28권 제1호(통권 제179호)
발행연도
2019.2
수록면
34 - 42 (9page)

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In this study, various alloying elements (Cr, Sr, Ca, Cd) were added to improve the mechanical properties of ADC12 fabricated by a die casting process. The effect of alloying elements on the microstructure and mechanical properties were investigated. The phase analysis results of the modified ADC12 alloy with conventional ADC12 alloy, showed the similar characteristics of Al matrix, Si phase, CuAl₂ phase and the Fe intermetallic phase. As a result of the microstructure observation, the secondary dendrite arm spacing (SDAS) was shown to have decreased after the addition of the alloying elements. The eutectic Si phase, which existed as flake form in the conventional ADC12 alloy, was modified finely as a fiber form in the modified ADC12 alloy. It was observed that the CuAl₂ phase as the strengthening phase was relatively finely distributed in the modified ADC12 alloy. The Fe intermetallic appeared as a Chinese script shaped Al<SUB>6</SUB> (Mn,Fe) which is detrimental to mechanical properties in conventional ADC12 alloy. On the other hand, in the modified ADC12 alloy, polyhedral α-Al<SUB>15</SUB>Si₂ (Fe,Mn,Cr)₃ was observed. The tensile properties were improved in the modified ADC12 alloy. The yield strength and tensile strength increased by 12.4% and 10.0%, respectively, in the modified ADC12 alloy, and the elongation was also seen to have been increased. As a result of the pin on disk wear test, the wear resistance properties were also improved by up to about 7% in the modified ADC12 alloy. It is noted that the wear deformation microstructures were also observed, and it was found that the fine eutectic Si and strengthening phases greatly improved abrasion resistance.

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Abstract
1. 서론
2. 실험방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2019-551-000442956