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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 임수근
- 발행연도
- 2016
- 저작권
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The effects of Mg addition on T6 properties and Fluidity of A356 alloy were investigated. Mg2Si formed with Mg addition in Al-Si alloy had been known to decrease its mechanical properties such as elongation, fracture toughness. On the other hand, Mg addition in Al-Si alloy have an positive effect on formation of eutectic Si and primary Al during solidification. If it is possible to control the Mg2Si formation with Mg addition, it will be increasing its mechanical properties with refinement of eutectic Si and primary Al. To analysis this effects, fluidity and tensile properties of as-cast A356 alloy with Mg contents was measured, and its microstructure was observed. Also, to investigate T6 properties of as-cast A356 alloy with Mg contents, tensile properties of A356 with Mg additions were measured, after solid solution heat treatment and aging heat treatment.
The addition of Mg in A356 alloy decreased the grain size and refined the eutectic Si with increased amount of Mg addition. and it is able to improve the mechanical properties. Solid solution heat treatment affect spheroidizing of eutectic Si. In this study, although eutectic Si was refined with Mg contents, solid solution time increased from 2 hours to 6 hours with Mg addition, and aging time also increased from 4 hours to 8 hours. Eutectic Si was refined during heat treatment but Mg2Si still remained formation of chinese script. and chinese script Mg2Si formed with Mg additions affected to reduce the elongation of the alloy as stress concentration. The fluidity of A356 alloy increased with addition of Mg until 1wt.%, after then the fluidity decreased.
The addition of Mg in A356 alloy decreased the grain size and refined the eutectic Si with increased amount of Mg addition. and it is able to improve the mechanical properties. Solid solution heat treatment affect spheroidizing of eutectic Si. In this study, although eutectic Si was refined with Mg contents, solid solution time increased from 2 hours to 6 hours with Mg addition, and aging time also increased from 4 hours to 8 hours. Eutectic Si was refined during heat treatment but Mg2Si still remained formation of chinese script. and chinese script Mg2Si formed with Mg additions affected to reduce the elongation of the alloy as stress concentration. The fluidity of A356 alloy increased with addition of Mg until 1wt.%, after then the fluidity decreased.
목차
Ⅰ. 서론 1Ⅱ. 이론적 배경 32.1 A356 합금의 개량화 처리 32.2 A356 합금에 대한 Mg첨가의 영향 42.3 A356 합금의 열처리 82.4 공정 Mg2Si 조직 제어 112.5 경사냉각판법 12Ⅲ. 실험방법 133.1 A356-xMg 합금 제조 133.1.1 주조재 제조 133.1.2 A356-xMg 합금 분석 143.2 A356-xMg 합금 T6열처리 193.2.1 열처리 시편 제조 193.2.2 T6열처리 193.2.3 열처리 특성 분석 203.3 A356-xMg 합금 유동성 평가 243.3.1 유동성 시험 243.3.2 유동성 특성 분석 24Ⅳ. 실험결과 및 고찰 274.1 A356-xMg 합금 주조재 특성 274.1.1 Mg첨가에 따른 결정립 크기와 기계적 특성 274.1.2 Mg첨가에 따른 미세조직 변화 324.1.3 A356-3Mg 합금 미세조직에 미치는 주조조건의 영향 374.2 A356-xMg 합금 T6열처리 특성 404.3 A356 합금 유동성에 미치는 Mg첨가의 영향 47Ⅴ. 결론 52Ⅵ. 참고문헌 53
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