粉末冶金技术2026，Vol.44Issue(2)：161-169,9.DOI:10.19591/j.cnki.cn11-1974/tf.2025060002
FGH96合金氧化膜溶解扩散及原始颗粒边界碳化物形成机制
Dissolution and diffusion of oxide films and formation mechanism of prior particle boundary carbides for FGH96 alloys
马驰 1刘杨 2王晓峰3
作者信息
- 1. 中国航发商用航空发动机有限责任公司,上海 200241
- 2. 北京科技大学新材料技术研究院,北京 100083
- 3. 中国航发北京航空材料研究所先进高温结构材料重点实验室,北京 100095
- 折叠
摘要
Abstract
To make certain the formation mechanism of carbides at prior particle boundary(PPB)during the densification of powder metallurgy(PM)superalloys,the FGH96 alloys with different relative density were employed by interrupted sintering method in this study.The dissolution behavior of oxide films and the growth behavior of carbides during densification were systematically investigated through scanning electron microscope and transmission electron microscope,elucidating the formation mechanism of a core-shell structure where the carbide phases encapsulated the oxide particles at PPB.The results indicate that the surface layers of FGH96 alloy powders consist of the amorphous oxide layers and M(Ti,Nb)C-type carbides with TiO2.Prior to the sinter neck formation,the amorphous oxide layers transform into the crystalline oxide particles,while the MC-type carbides at the powder surface grow by consuming the amorphous TiO2 and the carbon elements,diffusing from the matrix.Following the sinter neck formation,the partial oxide particles dissolve,leaving only the residual Al2O3 and ZrO2 particles at sintering neck interface.Meanwhile,the carbides progressively encapsulate the adjacent oxide particles during the subsequent growth stage,ultimately forming a core-shell structure with oxide cores enveloped by carbide shells.关键词
镍基粉末高温合金/氧化膜/原始颗粒边界/碳化物/遗传演变Key words
nickel-based powder superalloys/oxide films/prior particle boundary/carbides/genetic evolution分类
矿业与冶金引用本文复制引用
马驰,刘杨,王晓峰..FGH96合金氧化膜溶解扩散及原始颗粒边界碳化物形成机制[J].粉末冶金技术,2026,44(2):161-169,9.
