첨가제에 따른 AC4 A 합금의 수축성을 평가한 결과, Al-10%Sr을 첨가한 경우 조대 수축량은 큰 변화가 없었다.
As a result of evaluating the contractility of AC4 A alloys with additives, the coarse contraction did not change much when Al-10%Sr was added.