Aluminium - Calcium - Silicon

Rainer Schmid-Fetzer

Introduction

The liquidus surface of the Al-corner has been studied and fundamental agreement was obtained between most of the earlier experimental work [26Doa, 27Gro, 28Shi] and reviewing papers [34Fus, 43Mon, 52Han]. Samples were made from Ca-Al and Al-Si master alloys under a CaCl₂ or KCl-NaCl-BaCl₂ protective layer. Their composition was checked by chemical analysis, and thermal and metallographic analyses were performed [26Doa]. A dominating CaSi₂ liquidus surface extending close to the Al-corner and an eutectic type Al-CaSi₂ pseudobinary system was deduced from these data [26Doa] and essentially confirmed by similar studies [28Shi, 62Kol] and [66Tom]. The coexistence of (Al) and a compound, assumed to be CaSi₂, was also seen metallographically in Al-rich samples that were ...