Evolution of microstructure and mechanical property during long-term aging in Udimet 720Li

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	Evolution of microstructure and mechanical property during long-term aging in Udimet 720Li
	L. H. Zhou; V. Lupinc; J. T. Guo
	2001
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	17 期号:6 页码:633-637
摘要	Thermal stabilities of microstructure and mechanical property have been investigated on superalloy U720Li, which is of great interest of application for jet engine and land-based turbine disc. The results showed that, the primary and secondary gamma' particles maintain good thermal stability at 650 and 700 degreesC with aging time up to 3000 h, while the tertiary gamma' is apparently dependent on aging temperature and time. The tertiary gamma' particles undergo a procedure of coarsening, dissolution and eventually complete disappearance with the increasing of aging time and temperature. They exhibit unusual high sensibility upon aging temperature, which is attributed to the lattice misfit between the gamma' precipitates and the matrix in the alloy. The grain boundary phase M23C6 remains stable without forming of sigma phase even with aging time up to 3000 h at 700 degreesC. Microhardness decreases apparently with increasing aging time and aging temperature. Theoretical analysis based on dislocation mechanism indicates that the change of microhardness should be attributed to the evolution of the tertiary gamma' during aging.
部门归属	cnr, tempe, i-20125 milan, italy. cas, inst met res, shenyang 110016, peoples r china.;zhou, lh (reprint author), cas, inst met res, 72 wenhua rd, shenyang 110016, peoples r china
关键词	Gamma'
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WOS记录号	WOS:000172430100011
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36955
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. H. Zhou,V. Lupinc,J. T. Guo. Evolution of microstructure and mechanical property during long-term aging in Udimet 720Li[J]. Journal of Materials Science & Technology,2001,17(6):633-637.
APA	L. H. Zhou,V. Lupinc,&J. T. Guo.(2001).Evolution of microstructure and mechanical property during long-term aging in Udimet 720Li.Journal of Materials Science & Technology,17(6),633-637.
MLA	L. H. Zhou,et al."Evolution of microstructure and mechanical property during long-term aging in Udimet 720Li".Journal of Materials Science & Technology 17.6(2001):633-637.