Zirconium modified Nb-22Ti-16Si alloys fabricated by laser additive manufacturing: Microstructure and fracture toughness

被引：41

作者：

Li, Yunlong ^{[1
,2
]}

Lin, Xin ^{[1
,2
]}

Hu, Yunlong ^{[1
,2
]}

Kang, Nan ^{[1
,2
]}

Gao, Xuehao ^{[1
,2
]}

Dong, Hongbiao ^{[3
]}

Huang, Weidong ^{[1
,2
]}

机构：

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

[2] Northwestern Polytech Univ, MIIT China, Key Lab Met High Performance Addit Mfg & Innovat, Xian 710072, Shaanxi, Peoples R China

[3] Univ Leicester, Dept Engn, Leicester LE1 7RH, Leics, England

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 783卷

基金：

中国国家自然科学基金;

关键词：

Laser additive manufacturing; Nb-Si alloys; Powder mixture; Microstructure; Fracture toughness; SI-BASED ALLOYS; MECHANICAL-PROPERTIES; OXIDATION RESISTANCE; NB; PHASE; TI; EVOLUTION; ROOM; CR; STRENGTH;

D O I：

10.1016/j.jallcom.2018.12.280

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：

The microstructure and mechanical behavior of Nb-22Ti-16Si-xZr alloys (x = 0, 1, 5, 10, 15 at.%) were investigated by using laser solid forming (LSF) additive manufacturing from elemental powder mixture of Nb, Ti, Si and Zr. The as-deposited Nb-22Ti-16Si alloy presented a microstructure consisted of primary Nb-base solid solution (Nbss) dendrite and Nbss/(Nb)(3)Si eutectic dendrites. The eutectic Nbss/gamma-(Nb)(5)Si-3 appeared with a morphology of lamellar structural feature when 1 at.%Zr was added, and its content increased with Zr content. Nbss/(Nb)(3)Si eutectic dendrites disappeared when Zr content reaches 10 at.%. Further increasing of Zr (15 at.%) result in the appearance of a hypereutectic microstructure, which consisted by primary gamma-(Nb)(5)Si-3 and eutectic Nbss/y-(Nb)(5)Si-3. As the nominal Zr content increased, the fracture toughness of LSFed Nb-22Ti-16Si-xZr alloy increases first and reaches the maximum value (15.28 MPa m(1/2)) in LSFed Nb-22Ti-16Si-5Zr alloy, and then decreases. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：66 / 76

页数：11

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