Variation in morphology and crystallographic orientation of directionally solidified Nb-Si based alloys at high withdrawal rates

被引：13

作者：

Fang, Xin ^{[1
]}

Guo, Xiping ^{[1
]}

Qiao, Yanqiang ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, YouyiXi Rd 127, Xian 710072, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 819卷

基金：

国家重点研发计划;

关键词：

Nb-Si based alloy; Directional solidification; Crystallographic orientation; Eutectic growth; Growth direction; Morphology; TEMPERATURE FRACTURE-TOUGHNESS; MECHANICAL-PROPERTIES; MICROSTRUCTURE;

D O I：

10.1016/j.jallcom.2019.153023

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nb-Si based alloys are directionally solidified at the withdrawal rates of 100, 500 and 1000 mu m/s respectively. At the withdrawal rate of 100 mu m/s, the eutectic presents well-coupled lamellar structure. Besides, Nb-SS and gamma-(Nb, X)(5)Si-3 phases are well oriented along [111](Nb) and [0001](gamma) crystallographic orientations respectively and the crystallographic orientation relationship of <111>(Nb)//<0001>(gamma), {110}(Nb)//{10 (1) over bar0}(gamma) is obeyed. When the withdrawal rate reaches to 500 mu m/s, the eutectic begins to transform into irregular fibrous structure and no crystallographic orientation relationship can be detected, and it is caused by the variation in growth direction of Nbss phases from [111](Nb) to [100](Nb). (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：7

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