摘要
高铝锌合金ZA27加入稀土金属铈可使其铸态组织细化,强度和延伸率得到改善。当铈加入量<0.1％时,铈主要存在于合金的固溶体中。而当铈加入量约为1％时,可在合金中观察到化合物Ce_2Zn_(17)。加铈后成分过冷效应所引起的枝晶分枝熔断脱落现象可能对细化晶粒起主要作用。
The as-cast structure of the high-aluminium zinc foundry alloy ZA27 can be refined by addition of rare earth metal-cerium with the tensile strength and elongation of the alloy improved. Cerium exists mainly in solid solution in the alloy for small cerium additions (0.1%). While the compound Ce2Zn17 can be observed in the alloy for about 1 % cerium addition. For the grain refinement of the zinc alloy by cerium, remelting and breaking-off of the dendrite branches caused by constitutional undercooling seem to play impotant role.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
1992年第2期1-4,共4页
Special Casting & Nonferrous Alloys
