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Al-Mn 系 共晶組成 범위의 合金에 대한 一方向凝固

Title 
Al-Mn 系 共晶組成 범위의 合金에 대한 一方向凝固
Other Titles 
Unidirectional Solidification of Al-Mn off Eutectic Alloys
Authors 
朴炳玉
Issue Date 
1983
Journal 
연구논문집
Vol. 
Vol.8
Issue 
No. 1
Pages 
75-80
Abstract 
Al-Mn 系 共晶범위의 合金을 溫度勾配 G=80℃/㎝ 및 凝固速度(R) 0.01에서 0.20 ㎝/min 으로 변화시켜 一方向凝固시켰다. 이때 Mn 量과 G/R에 따른 凝固組織 및 機械的 性質을 비교하여 다음과 같은 結果를 얻었다. 1) G/R의 감소에 따라 Al-Mn 共晶은 Composite(blase type) 組織에서 Colony 組織으로 변화하였고, Al-Mn 共晶부근의 合金은 Composite에서 Denderite(piller type) 組織으로 변화하였다. 2) G/R이 감소할수록(최소 G/R=571℃·min/㎠) 引張 및 降伏强度가 증가하였다. 3) Al-Mn 共晶부근의 合金은 引張試驗시 연성파괴의 현상이 관찰되었다.
Al-Mn off eutectic alloys were unidirectionally Solidified at temperature gradients G=80℃/㎝ and Solidification rates R=0.01 to 0.20 ㎝/min. The effects of G/R and the contents of manganese on Structures and mechanical properties were investigated. The results obtained are as follows. 1) As G/R decreased, The morphology of the structure changed from the Composite (blade type) into the colony in Al-Mn eutectic alloys, but from the composite into the dendrite (piller type) in Al-Mn off eutectic alloys. 2) The decreased G/R (minimum G/R=571℃·min/㎠) resulted in the higher mechanical strength. 3) Al-Mn off eutectic alloys showed ductile fracture.
URI 
http://repository.uc.ac.kr/handle/2014.oak/787
ISSN 
1598-3390
Appears in Collections
04. 기계공학부 > 연구논문

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