Pore evolution regulation in synthesis of open pore structured Ti-Al intermetallic compounds by solid diffusion

被引：23

作者：

Chen, M. R. ^{[1
]}

Jiang, Y. ^{[1
]}

He, Y. H. ^{[1
]}

Lin, L. W. ^{[1
]}

Huang, B. Y. ^{[1
]}

Liu, C. T. ^{[2
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[2] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 521卷

关键词：

Diffusion model; Core-shell structure; Open pore; Kirkendall effect; Ti-Al intermetallics; KIRKENDALL; MANIFESTATIONS; POROSITY; ALLOY;

D O I：

10.1016/j.jallcom.2012.01.107

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：

A method based on diffusion model simulation and calculation was used to discuss the pore evolution regulation of porous Ti-Al intermetallic compounds. According to the basic structure characteristics of Ti-Al compacts, a sandwich core-shell structured powder diffusion couple model and two pore evolution conditions were used to reveal the pore evolution regulations in Ti-Al porous alloy, which is mainly caused by the Kirkendall effect. The growth of the pore evolution layer is consistent with the consumption of the initial Al shell, and the dimension of the pore evolution layer is independent on the dimension of the core of Ti particle. An equation reflecting the evolution porosity and the physical parameters of diffusion components was established. The evolution porosity was confirmed to be a function of the concentration and density of diffusion elements. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：12 / 15

页数：4

共 25 条

[1] CONTROLLED POROSITY BY AN EXTREME KIRKENDALL EFFECT [J].

ALDINGER, F .

ACTA METALLURGICA, 1974, 22 (07) :923-928

[2]

Aniruddha B., 2005, ACTA MAT, V53, P1415

[3] Intrinsic and extrinsic fracture resistance in lamellar TiAl alloys [J].

Chan, KS ;

Wang, P ;

Bhate, N ;

Kumar, KS .

ACTA MATERIALIA, 2004, 52 (15) :4601-4614

[4]

Chua L., 2004, MAT SCI ENG A-STRUCT, V366, P114

[5] Formation of nanotubes and hollow nanoparticles based on Kirkendall and diffusion processes:: A review [J].

Fan, Hong Jin ;

Goesele, Ulrich ;

Zacharias, Margit .

SMALL, 2007, 3 (10) :1660-1671

[6] Influence of surface diffusion on the formation of hollow nanostructures induced by the Kirkendall effect: The basic concept [J].

Fan, Hong Jin ;

Knez, Mato ;

Scholz, Roland ;

Hesse, Dietrich ;

Nielsch, Kornelius ;

Zacharias, Margit ;

Gosele, Ulrich .

NANO LETTERS, 2007, 7 (04) :993-997

[7] Porous FeAl intermetallics fabricated by elemental powder reactive synthesis [J].

Gao, Haiyan ;

He, Yuehui ;

Shen, Peizhi ;

Zou, Jin ;

Xu, Nanping ;

Jiang, Yao ;

Huang, Baiyun ;

Liu, C. T. .

INTERMETALLICS, 2009, 17 (12) :1041-1046

[8] Fabrication of Ti-Al micro/nanometer-sized porous alloys through the Kirkendall effect [J].

He, Yuehui ;

Jiang, Yao ;

Xu, Nanping ;

Zou, Jin ;

Huang, Baiyun ;

Liu, Chain T. ;

Liaw, Peter K. .

ADVANCED MATERIALS, 2007, 19 (16) :2102-+

[9] Analysis of the Kirkendall effect, marker migration and pore formation [J].

Höglund, L ;

Ågren, J .

ACTA MATERIALIA, 2001, 49 (08) :1311-1317

[10] Effects of the Al content on pore structures of porous Ti-Al alloys [J].

Jiang, Y. ;

He, Y. H. ;

Xu, N. P. ;

Zou, J. ;

Huang, B. Y. ;

Liu, C. T. .

INTERMETALLICS, 2008, 16 (02) :327-332

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