Effect of Al₂Ca on Oxidation Resistance and Tensile Property of Al-5Mg Alloy

Abstract

The effect of Al 2 Ca on the oxidation resistance and tensile property of Al-5Mg alloys was investigated. According to the TGA (Thermogravimetric analysis) result at 550 o C after 24hrs, the Al-5Mg alloy showed parabolic behavior with weight gain. On the other hand, there was almost no difference in the weight changes of the Al 2 Ca added Al-5Mg alloys during the oxidation. It was thought that the improvement of oxidation resistance in Al 2 Ca added Al-5Mg alloys might be due to the formation of a protective oxide layer with CaO and MgO on the surface. The microstructures of the alloys showed grain refinement with an increasing Al 2 Ca content. From the tensile test, the yield strength of the alloys were improved with an increasing Al 2 Ca content. The 0.07 mass%Al 2 Ca added Al-5Mg alloy showed similar elongation and increased strength, simultaneously. It was considered that the addition of Al 2 Ca, which was superior in the oxidation resistance of Al, reduced the formation of Mg oxides and inclusions during the alloying. This, partly led to the improvement of tensile properties. . 이와 같은 문제를 해결하기 위한 일반적인 방법으로 Be 첨가가 고려되어질 수 있다 [7,8]. 그러나, Be의 강한 독성 때 문에 대체방안이 요구된다 [7,8].한편, 한 연구보고에 따르면 합금원소로서 순Mg이 아닌

Strength Analysis of Aluminum Alloy Window Wiper Manufactured by Die Casting

“…Further, the cost competitiveness improved, and the manufacturing process of aluminum alloy window wipers was simplified. , 비철합금의 적용 [4][5][6] , 제조공법의 변화 [7,8] 등이 지속적으로 이루어 지고 있다 [9][10][11][12] .최근에는 자동차 샤시 뿐만 아니라 부품 경량화를 위해 Al의 적 용이 연구되고 있다.이와 같은 Al의 한계를 극복하기 위하여 자동차 부품에 적용이 가능한 Al-Mg 합금이 개발된 바 있다 [13] . 일반적인 스틸 윈도우 와 이퍼는 …”