摘要
研究了添加微量Au或Sn作为孕育形核剂进行孕育形核处理对金锡共晶合金Au20Sn铸态凝固组织的影响。结果表明:添加微量Au或Sn进行孕育形核处理均将显著改善金锡共晶合金铸态凝固组织,特别是改变了初生相的结构、形貌和尺寸。初生相的结构由传统凝固组织中的’-Au5Sn相改变为-AuSn相,初生相的形貌和尺寸由粗大且分布不均的树枝状改变为细小且分布较为均匀的棒状或卵状,而且添加微量Sn比添加微量Au孕育形核处理后得到的凝固组织中初生相更趋均匀;同时,孕育形核处理也细化了共晶层片组织,共晶团的平均尺寸明显减小。
The effects of incubated nucleation treatment with adding trace Au or Sn on the solidification microstructure of Au-Sn eutectic alloy Au20Sn were investigated. The results indicate that compared with no incubated nucleation treatment, the solidification microstructures of Au-Sn eutectic alloy are modified greatly by incubated nucleation treatment with Au or Sn. The structure, the morphology and the size of the primary phase are also changed. The primary phase transforms into d-AuSn phase with the shape of rod or egg of uniform distribution and small size from conventional 5 ’-Au5Sn phase with coarse dendrite of non-uniform distribution. The primary d-AuSn phase in the solidification microstructure becomes more uniform by adding trace Sn than by adding trace Au. Meanwhile the eutectic structure is also refined by the incubated nucleation treatment.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第4期756-760,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50964014
51161024)
关键词
金锡共晶合金
孕育形核
凝固组织
初生相
Au-Sn eutectic alloy
incubated nucleation
solidification microstructure
primary phase
