Selective evolution of secondary gamma' precipitation in a Ni-based single crystal superalloy both in the gamma matrix and at the dislocation nodes

IMR OpenIR

	Selective evolution of secondary gamma' precipitation in a Ni-based single crystal superalloy both in the gamma matrix and at the dislocation nodes
	Xiang, SS; Mao, SC; Wei, H; Liu, YN; Zhang, JX; Shen, ZJ; Long, HB; Zhang, HY; Wang, XG; Zhang, Z; Han, XD; Han, XD (reprint author), Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing 100124, Peoples R China.; Liu, YN (reprint author), Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia.
	2016-09-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	116 页码:343-353
摘要	Two distinct evolutionary processes of secondary gamma' precipitates in a Ni-based single crystal superalloy were revealed by means of Cs-corrected high-resolution transmission electron microscopy (HRTEM) and corresponding X-ray energy dispersive spectroscopy analyses. Upon creep testing at elevated temperatures, it was determined that large quantities of secondary gamma' precipitates were formed. The precipitates were found to select two distinctive forms and routes: one randomly dispersed in the gamma matrix (2nd gamma'(gamma)), and the other formed at nodes of dislocation networks (2nd gamma'(d)) in regular arrays. These two types of secondary gamma' precipitates exhibited different evolutionary morphologies and mechanisms. The 2nd gamma'(gamma) precipitates progressively evolved in shape from spherical to cuboidal and then to butterfly-like shapes, and the mean size also increased gradually from 11 nm to 34 nm. The 2nd gamma'(d) precipitates exhibited stable cuboidal morphology and a mean size of 30 nm. These differences are attributable to the different element transport conditions for the two types of precipitates, i.e., an uphill diffusion for the 2nd gamma'(gamma) precipitates and a dislocation network pipe transportation for the 2nd gamma'(d) precipitates. The 2nd gamma'(gamma) precipitates show severe segregation of gamma'-rich elements of Ni and Al and deficiency of gamma'-poor elements of Cr compared with the 2nd gamma'(d) precipitates. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[xiang, sisi ; mao, shengcheng ; long, haibo ; zhang, ze ; han, xiaodong] beijing univ technol, inst microstruct & property adv mat, beijing 100124, peoples r china ; [xiang, sisi ; mao, shengcheng ; long, haibo ; zhang, ze ; han, xiaodong] beijing univ technol, beijing key lab microstruct & property adv mat, beijing 100124, peoples r china ; [wei, hua ; zhang, hongyu ; wang, xinguang] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china ; [liu, yinong] univ western australia, sch mech & chem engn, crawley, wa 6009, australia ; [zhang, jianxin] shandong univ, key lab liquid struct & hered mat, minist educ, jinan 250061, peoples r china ; [shen, zhenju ; zhang, ze] zhejiang univ, state key lab silicon mat, hangzhou 310058, zhejiang, peoples r china ; [shen, zhenju ; zhang, ze] zhejiang univ, dept mat sci & engn, hangzhou 310058, zhejiang, peoples r china
关键词	Ni-based Superalloys Creep Precipitates Dislocation Node Order-disorder Transition
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	Beijing Municipal Education Commission [KM201410005033]; NSFC [51371173, 51231008, 11327901, 51001003]; Beijing Nova Program [xx2014B108]; Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality [IDHT20140504]; Rixin talent of BJUT, Beijing University of Technology
收录类别	sci
语种	英语
WOS记录号	WOS:000382340400032
引用统计	被引频次：62[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/321006/76288
专题	中国科学院金属研究所
通讯作者	Mao, SC; Han, XD (reprint author), Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing 100124, Peoples R China.; Liu, YN (reprint author), Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia.
推荐引用方式 GB/T 7714	Xiang, SS,Mao, SC,Wei, H,et al. Selective evolution of secondary gamma' precipitation in a Ni-based single crystal superalloy both in the gamma matrix and at the dislocation nodes[J]. ACTA MATERIALIA,2016,116:343-353.
APA	Xiang, SS.,Mao, SC.,Wei, H.,Liu, YN.,Zhang, JX.,...&Liu, YN .(2016).Selective evolution of secondary gamma' precipitation in a Ni-based single crystal superalloy both in the gamma matrix and at the dislocation nodes.ACTA MATERIALIA,116,343-353.
MLA	Xiang, SS,et al."Selective evolution of secondary gamma' precipitation in a Ni-based single crystal superalloy both in the gamma matrix and at the dislocation nodes".ACTA MATERIALIA 116(2016):343-353.