摘要
采用机械合金化及放电等离子烧结方法制备超细晶/纳米晶TiAl基合金,并利用差热分析仪进行循环高温氧化试验,研究粉末机械合金化对烧结细晶粒TiAl基合金组织及高温氧化性能的影响。结果表明,球磨是获得细晶粒组织的原因,粉末经球磨及放电等离子烧结后,形成了细小、球状的TiAl和Ti3Al相组织;该细晶粒组织在高温循环氧化条件下显示出较高的抗氧化性,且随Nb量增加抗氧化性得到提高,升温阶段的氧化速率最快。
TiAl based alloy with ultrafine grain structure were prepared by mechanical alloying and spark plasma sintering（SPS）.And high temperature cycle oxidation behavior was tested by DSC.The effects of mechanical alloying on the fine-grain microstructure and high temperature oxidation resistance were investigated.Result show that the fine microstructure is attributed to ball milling.Fine and nodular TiAl and Ti3Al phases are formed after ball milling and SPS.Fine microstructure display higher oxidation resistance under high temperature cycle oxidation condition.The oxidation resistance of TiAl based alloy is improved with Nb content increasing.The oxidation rate is the fastest in the heating stage.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第2期301-306,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50771023)
吉林省教育厅"十一五"科研基金(2009115)
关键词
高能球磨
放电等离子烧结
细晶TiAl基合金
高温循环氧化
high energy ball milling
spark plasma sintering
fine-grain TiAl based alloy
high temperature cycle oxidation
