Influence of additions of Zr, Ti-B, Sr, and Si as well as of mold temperature on the hot-tearing susceptibility of an experimental Al-2% Cu-1% Si alloy

摘要

This study was undertaken to investigate the effects of chemical composition and mold temperature (MT) on the hot-tearing susceptibility (HTS) of an experimental Al-2% Cu-1% Si alloy using a constrained rod casting mold. The HTS results were then compared with 206 (Al-5 wt% Cu) alloys containing the same additions. In general, the Al-2% Cu-1% Si based alloys exhibited higher resistance to hot-tearing than did the 206-based alloys. It was found that an elevated MT is beneficial in reducing the HTS of the Al-2% Cu-1% Si and 206 alloys in that the HTS value decreased from over 21 to less than 5, as the MT was increased from 250 to 450 °C. Increasing the Si content reduced the HTS of the Al-2% Cu-1% Si alloy considerably; this reduction may be attributed to an increase in the volume fraction of eutectic in the structure. The addition of Sr caused deterioration in the hot-tearing resistance of the base alloy due to the formation of Sr-oxides and an extension of the freezing range of the alloy. The refinement of the grain structure obtained with the Zr-Ti-B addition decreased the severity of hot-tearing as a result of an increase in the number of intergranular liquid films per unit volume and a delay in reaching the coherency point. It was also observed that α-Fe intermetallic particles may impede the propagation of hot-tearing cracks. The Al-2% Cu-1% Si alloy with 1 wt% Si addition was judged to be the best composition in view of its low HTS.