采用XRD, OM, SEM, EDAX等探讨了一种新型Al3Ti1B1RE中间合金细化剂对罐用铝材的细化效果及RE的作用. 结果表明, 该细化剂对罐用铝材的细化效果优于进口和国产Al5Ti1B, 且具有长效性, 达6 h后仍未见明显衰退, 明显提高了该材料的强度和塑性; 其细化效果及稳定性好的主要原因是: RE可降低铝液的表面能, 增加铝液对细化核心(如TiAl3, TiB2)的润湿性, 既充分发挥了异质形核作用,又防止了TiB2聚集沉淀倾向; RE也极易在结晶前沿富集造成成分过冷, 阻碍了α-Al晶粒生长, 并促进其在细化核心上形核; 此外RE还兼有一定的净化、细化和变质作用, 尤其是净化作用提高了该细化剂的冶金质量.
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