Effect of Al addition on mechanical properties and microstructure of refractory AlxHfNbTaTiZr alloys

被引：254

作者：

Lin, Chun-Ming ^{[1
]}

Juan, Chien-Chang ^{[1
]}

Chang, Chia-Hsiu ^{[1
]}

Tsai, Che-Wei ^{[1
]}

Yeh, Jien-Wei ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 624卷

关键词：

High-entropy alloys; Refractory alloys; Mechanical property; Solution hardening; PRINCIPAL ELEMENT ALLOYS; HIGH-ENTROPY ALLOYS; LOW-DENSITY; TM TM; TI; TEMPERATURE; ZR; BEHAVIOR; ALUMINUM;

D O I：

10.1016/j.jallcom.2014.11.064

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：

This study developed a series of refractory AlxHfNbTaTiZr high-entropy alloys (HEAs) with an aim to improve strength, and reduce density of the very ductile base alloy HfNbTaTiZr. Despite the diversity of crystal structures among the constituent elements, all the HEAs are single solid solution phase with body-centered cubic (BCC) structure. The addition of Al significantly improves the strength but reduces the ductility due to large solution hardening. The linear relation between yield strength and atomic percentage of Al suggests that the strengthening effect of a certain element in a single-phase HEA alloy can be explained based on quasi-binary alloy concept. Crack formations in deformed AlHfNbTaTiZr alloy with the lowest fracture strain are mainly along the boundaries between dendrite and interdendrite. This agrees with its large deviation of Al content and thus strength between dendrite and interdendrite. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：100 / 107

页数：8

共 35 条

[1]

Alma V., 2011, J ALLOY COMPD, V509, P7027

[2]

[Anonymous], 1978, HDB COMM MET HDB ASM

[3] SOLID-SOLUTION HARDENING [J].

BUTT, MZ ;

FELTHAM, P .

JOURNAL OF MATERIALS SCIENCE, 1993, 28 (10) :2557-2576

[4] Calculation of Debye temperature for crystalline structures - A case study on Ti, Zr, and Hf [J].

Chen, Q ;

Sundman, B .

ACTA MATERIALIA, 2001, 49 (06) :947-961

[5] Microstructure of a near-equimolar refractory high-entropy alloy [J].

Couzinie, J. P. ;

Dirras, G. ;

Perriere, L. ;

Chauveau, T. ;

Leroy, E. ;

Champion, Y. ;

Guillot, I. .

MATERIALS LETTERS, 2014, 126 :285-287

[6] First-principles calculations of the structural and thermodynamic properties of bcc, fcc and hcp solid solutions in the Al-TM (TM = Ti, Zr and Hf) systems: A comparison of cluster expansion and supercell methods [J].

Ghosh, G. ;

van de Walle, A. ;

Asta, M. .

ACTA MATERIALIA, 2008, 56 (13) :3202-3221

[7] First-principles calculation of structural energetics of Al-TM (TM = Ti, Zr, Hf) intermetallics [J].

Ghosh, G ;

Asta, M .

ACTA MATERIALIA, 2005, 53 (11) :3225-3252

[8] Effect of withdrawal rates on microstructures and room temperature fracture toughness in a directionally solidified Nb-Ti-Cr-Si based alloy [J].

Guo, Baohui ;

Guo, Xiping .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2014, 617 :39-45

[9]

Hosford WF, 2010, Mechanical behavior of materials

[10] Microstructure evolution and mechanical properties of intermetallic Ni-xSi (x=5, 10, 15, 20) alloys [J].

Karakose, Ercan ;

Keskin, Mustafa .

JOURNAL OF ALLOYS AND COMPOUNDS, 2012, 528 :63-69

← 1 2 3 4 →