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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 박익민
- 발행연도
- 2016
- 저작권
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The present study aimed to design the new heat resistant magnesium alloy alternating Mg-4Al-2RE(AE42) and Mg-4Al-4RE(AE44) alloy. Therefore, the Mg-xSn-5Al-1Zn (x= 0, 1, 3, 5, 7, 9wt.%) alloys were fabricated by gravity casting method.
The microstructure of the AZ51 alloy mainly consisted of α-Mg and Mg17Al12 phases. With increase of Sn addition, the Mg2Sn phase was newly precipitated along grain boundaries. And also, the volume fraction of secondary phases was increased and the grain size was slightly decreased.
The hardness and yield strength were increased with increase of Sn contents. On the other hand, the ultimate tensile strength was increased up to 7wt.%Sn addition and the elongation was increased up to 5wt.%Sn addition, and then they were decreased. From the SEM In-situ fracture test results, when adding high Sn contents(>7wt.%), the fracture mechanism is changed from Mg/Mg17Al12 interface to brittle Mg2Sn phase. Therefore, the elongation was decreased though the hardness and yield strength were improved. From the creep test results, the void was initiated near Mg17Al12 phase. And then, the crack was propagated along graiboundaries. Mg2Sn phase effectively prohibited the crack propagation, therefore, the creep resistance was improved by Sn additions.
From the potentiodynamic, A.C impedance and immersion test results, the corrosion resistance was improved by Sn additions. The corrosion mechanism is confirmed by galvanic corrosion at α-Mg/Mg17Al12 phase and the corrosion product is confirmed as Mg(OH)2. The corrosion resistance was improved by refining microstructure and stabilization of protective film.
The microstructure of the AZ51 alloy mainly consisted of α-Mg and Mg17Al12 phases. With increase of Sn addition, the Mg2Sn phase was newly precipitated along grain boundaries. And also, the volume fraction of secondary phases was increased and the grain size was slightly decreased.
The hardness and yield strength were increased with increase of Sn contents. On the other hand, the ultimate tensile strength was increased up to 7wt.%Sn addition and the elongation was increased up to 5wt.%Sn addition, and then they were decreased. From the SEM In-situ fracture test results, when adding high Sn contents(>7wt.%), the fracture mechanism is changed from Mg/Mg17Al12 interface to brittle Mg2Sn phase. Therefore, the elongation was decreased though the hardness and yield strength were improved. From the creep test results, the void was initiated near Mg17Al12 phase. And then, the crack was propagated along graiboundaries. Mg2Sn phase effectively prohibited the crack propagation, therefore, the creep resistance was improved by Sn additions.
From the potentiodynamic, A.C impedance and immersion test results, the corrosion resistance was improved by Sn additions. The corrosion mechanism is confirmed by galvanic corrosion at α-Mg/Mg17Al12 phase and the corrosion product is confirmed as Mg(OH)2. The corrosion resistance was improved by refining microstructure and stabilization of protective film.
목차
제1장 서론 11.1 개요 11.2 연구 목적 9제2장 마그네슘 합금의 설계 및 연구개발 동향 152.1 마그네슘의 특성 152.2 마그네슘 합금의 설계 172.2.1 미세조직 제어 방안 172.2.1 합금 원소 첨가의 영향 232.3 마그네슘 합금의 종류 292.3.1 주조용 마그네슘 합금 352.3.2 가공용 마그네슘 합금 382.4 종래의 내열 마그네슘 합금 개발 연구 40제3장 이론적 배경 433.1 Creep변형의 일반적인 기구 433.2 파괴 503.2.1 파괴의 종류 503.2.2 파괴 인성 533.3 부식 특성 563.3.1 마그네슘 합금의 내식성 563.3.2 음차 효과(Negative Difference Effect) 60제4장 실험 방법 634.1 합금 설계 634.2 합금 용해 및 주조 714.2.1 전처리 714.2.2 합금 원소 및 조성 714.2.3 용해 714.3 미세조직 관찰 764.4 기계적 특성 평가 774.4.1 경도 측정 774.4.2 인장 실험 774.4.3 크리프 실험 784.4.4 SEM In-situ 파괴 실험 804.5 부식 특성 평가 824.5.1 동전위 분극 실험 824.5.2 A.C 임피던스 실험 844.5.3 침지 실험 86제5장 Mg-xSn-5Al-1Zn 합금의 미세조직과 상온 및 고온 기계적 특성 875.1 서론 875.2 미세조직 895.3 경도 및 인장 특성 1005.4 SEM In-situ 파괴 거동 1095.5 크리프 특성 1235.6 소결론 138제6장 Mg-xSn-5Al-1Zn 합금의 부식 특성 1406.1 서론 1406.2 동전위 분극 실험 1426.3 A.C 임피던스 1476.4 침지 실험 1516.5 부식면 관찰 1536.6 소결론 165제7장 결론 166참고문헌 168Abstract 175
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