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金属学报  1994, Vol. 30 Issue (10): 453-462    
  论文 本期目录 | 过刊浏览 |
镍基单晶高温合金中γ′相的类树枝晶生长特征
张静华;姚向东;张志亚;李英敖;管恒荣;胡壮麒
中国科学院金属研究所
PSEUDO-DENDRITE GROWTH CHARACTERISTICS OF γ′PRECIPITATES IN SINGLE CRYSTAL NICKEL BASE SUPERALLOY
ZHANG Jinghua; YAO Xiangdong;ZHANG Zhiya; LI Yingao;GUAN Hengrong;HU Zhuangqi(Institute of Metal Research; Chinese Academy of Sciences; Shenyang)(Manuscript received 17 March; 1994)
引用本文:

张静华;姚向东;张志亚;李英敖;管恒荣;胡壮麒. 镍基单晶高温合金中γ′相的类树枝晶生长特征[J]. 金属学报, 1994, 30(10): 453-462.
, , , , , . PSEUDO-DENDRITE GROWTH CHARACTERISTICS OF γ′PRECIPITATES IN SINGLE CRYSTAL NICKEL BASE SUPERALLOY[J]. Acta Metall Sin, 1994, 30(10): 453-462.

全文: PDF(817 KB)  
摘要: 镍基单晶高温合金经充分均匀化、高温固溶和直接按时效处理后,沉淀出一种类树枝晶形态γ′相.类树枝晶γ′相的析出温度(T_(sγ′))敏感于局部合金成分,它的形核密度(I)与过冷度(△T_(γ′))成指数关系:I(μm~(-2))=2.5×10~(-3)exp(0,11△T_(γ′)).在较小过冷度,类树枝晶γ′相尺寸与直接时效时间成正比.它的择优生长方向是〈110〉,与基体取向相同,完全共格.类树枝晶γ′的形核机制包括扩散和非扩散两种,并趋向对称形核.
关键词 类树枝晶相单晶高温合金直接时效过冷度    
Abstract:An investigation has been made of the nucleation and growth characteristics of the pseudo-dendritic γ′precipitates in a single crystal nickel base superalloy which is directly aged after homogenizing and solutioning at high temperature. The results show that the temperature for the pseudo-dendritic γ′ precipitation is sensitive to the alloy composition in local area and that the relationship between the nucleation density (Ⅰ) and undercooling (△Tγ′) for the pseudo-dendritic γ′ precipitates is given by logarithmic expression: I(μm~2) = 2.5×10~(-3) exp(0. 11△T_(γ′)). The size of the pseudo-dendritic γ′precipitates is proportional to the direct aging time under small undercooling. The preferential growth direction of the pseudo-dendrite γ′precipiatates is <110> which is completely coherent with matrix. The formation mechanism for pseudo-dendrite γ′prencipitates involves both the diffusion and non- diffusion controlled. It intends to form nucleus symmetrically.Correspondent: ZHANG Jinghua, assoiate professor, Institute of Metal Research, Chinese Academy of Sci ences. Shenyang 110015
Key words pseudo-dendrite    single crystal superalloy    direct ageing    undercooling
收稿日期: 1994-10-18     
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