Effects of cold compacting pressure on the expansion behavior of Ti-48Al during sintering

Ye, Shulong1; Hao, Huali1; Mo, Wei1; Yu, Kaiping1; Liu, Litao1; Deng, Chengji2; Yu, Peng1

2016-07-15

10.1016/j.jallcom.2016.03.026

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

Porous TiAl intermetallic samples are successfully fabricated via an elemental powder metallurgy route. Cylindrical green samples are prepared by cold pressing of Ti-48Al elemental powders under different pressures. They are subsequently sintered in a dilatometer or a tube furnace. In the sintering, chemical reactions happens through discrepant diffusions between Ti and Al caused by the Kirkendall effect, which forms pores in the material and makes it expand in the sintering. The expansion happens in an anisotropic way, in which the axial expansion is larger than the radial expansion, especially for samples pressed under low pressure. As the compacting pressure increasing, the difference between axial and radial expansions gradually diminishes. Moreover, increasing pressure also leads to higher green density and better bonding between Ti and Al particles, therefore facilitating the diffusion and reactions between Ti and Al. As a result, the samples compacted under higher pressures experience larger expansion compared to those compacted under lower pressures. However, in spite of the larger expansion, the samples compacted under higher pressures still exhibit higher sintering density and compressive strength than those compacted under lower pressures. (C) 2016 Elsevier B.V. All rights reserved.

TiAl intermetallic Sintering Expansion Porous material Kirkendall effect

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[51574187] ; National Natural Science Foundation of China[51274156]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000373466400053

ELSEVIER SCIENCE SA

20181304943899

Aluminum ; Binary alloys ; Chemical bonds ; Compressive strength ; Diffusion ; Expansion ; Intermetallics ; Porous materials ; Powder metallurgy ; Powders ; Sintering ; Titanium alloys

Metallurgy:531.1 ; Aluminum:541.1 ; Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Physical Chemistry:801.4 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.South Univ Sci & Technol China, Shenzhen Key Lab Nanoimprint Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China

Ye, Shulong,Hao, Huali,Mo, Wei,et al. Effects of cold compacting pressure on the expansion behavior of Ti-48Al during sintering[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2016,673:399-404.

Ye, Shulong.,Hao, Huali.,Mo, Wei.,Yu, Kaiping.,Liu, Litao.,...&Yu, Peng.(2016).Effects of cold compacting pressure on the expansion behavior of Ti-48Al during sintering.JOURNAL OF ALLOYS AND COMPOUNDS,673,399-404.

Ye, Shulong,et al."Effects of cold compacting pressure on the expansion behavior of Ti-48Al during sintering".JOURNAL OF ALLOYS AND COMPOUNDS 673(2016):399-404.