CuFe合金微观组织中的枝晶生长  

Dendrite Growth in the Microstructure of Cu-Fe Alloys

作　　者：虞明香[1] 张俊婷[1] 王宥宏[1] 

机构地区：[1]太原科技大学材料与工程学院,山西太原030024

出　　处：《铸造技术》2011年第5期635-637,共3页Foundry Technology

基　　金：国家自然科学基金(编号:50804032);校博士启动基金(编号:200762)资助

摘　　要：研究了含铁20%、30%和40%的Cu-Fe包晶合金微观组织中的富Fe枝晶生长行为。结果表明,过冷液相的传热能力影响微观组织中枝晶的分布。当传热能力较强时,枝晶的分布较为均匀,枝晶的大小差别较小;反之,则枝晶分布不匀,且尺寸差别较大。对于溶质含量较低的合金,微观组织中枝晶分布的随机性与浓度起伏的不确定性有关。在溶质富集微区的过冷液相中容易产生枝晶晶核。随着溶质Fe含量的增加,单位面积上富Fe枝晶所占的比例、枝晶分枝的层次、枝晶分枝长度和密度都明显增加,而分枝的直径增加较少。溶质富集主要影响枝晶的侧向生长,而枝晶尖端的生长受溶质富集的影响较小。The rich-Fe dendrite growth in the microstructure of the Cu-Fe peritectic alloys containing 20,30 and 40% Fe is studied in the article.The results show： The dendrite distribution in the microstructure is effected by the heat-transfer capability of supercooled melts.When the heat-transfer capability is high,The dendrite distribution and the size of dendrite will be uniform.Whereas,the dendrite distribution and the size of dendrite will be uneven.To the dilute alloys,the randomness of the dendrite distribution in the microstructure has some connection with the nondeterminacy of composition fluctuations.The crystal nucleus of dendrite is easily bring up in the zone of composition fluctuations in supercooled melts.As increasing of Fe solute,the ratio of rich-Fe dendrite on unit area,the level of the bifurcation of dendrite,the length and density of the dendrite bifurcation are all increased distinctly,but the diameter of the dendrite bifurcation is increased a little.The solute enrichment mainly effects the sidewise growth of dendrute rather than the top gorwth of dendrite.

关 键 词：CU-FE合金 枝晶生长 微观组织 

分 类 号：TG111[金属学及工艺—物理冶金]