Abstract A superior anti Si-poisoning Al-Ti-Nb-B refiner with Ti:Nb=1:4 and M:B = 8:1 (M=Ti, Nb) was developed by a comprehensive data screening on the Al-10Si/Al-Ti-Nb-B system with thermodynamic calculations, by which the refinement level for Al-10Si alloys was upgraded to 109~125 μm, significantly extending the grain size tailoring scope for the aluminum casting industry. The synergistic effect of Ti/Nb not only bestowed an appreciable amount of high-potency aluminides during solidification but also formed NbB2-TiB2 core-shell structure which created an effective diboride substrate for nucleating α-Al. These results shed new lights on designing innovative anti Si-poisoning refiners by composition engineering.

中文翻译：

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新型 Al-Ti-Nb-B 晶粒细化剂对 Al-Si 合金具有卓越的效率

摘要 通过对 Al-10Si 的综合数据筛选，开发了一种具有 Ti:Nb=1:4 和 M:B = 8:1 (M=Ti, Nb) 的优良抗 Si 中毒 Al-Ti-Nb-B 精炼剂。 /Al-Ti-Nb-B系热力学计算，将Al-10Si合金的细化水平提升至109~125 μm，显着扩大了铝铸造行业的晶粒尺寸裁剪范围。Ti/Nb 的协同效应不仅在凝固过程中赋予了大量的高效铝化物，而且形成了 NbB2-TiB2 核壳结构，为α-Al 成核提供了有效的二硼化物基质。这些结果为通过成分工程设计创新的抗硅中毒精炼机提供了新的思路。