Influences of sintering parameters on shape-retention ability of porous Ni3Al intermetallic fabricated by powder metallurgy

Jiang, Heng; Ye, Shulong; Ma, Rui; Yu, Peng

2019-02

10.1016/j.intermet.2018.11.009

INTERMETALLICS   影响因子和分区

0966-9795

1879-0216

Porous Ni3Al intermetallic is successfully fabricated through elemental powder metallurgy of Ni-25 at% Al samples. The influences of sintering parameters, such as heating rate, isothermal treatment on the sintering behaviors of the samples are investigated. When the samples are heated continuously from room temperature to 1000 degrees C at a relatively high rate (> 5 degrees C/min), the reaction between Ni and Al happens in an intense way. The heat suddenly released by the reaction produces liquid phase in the material, which facilitates the reaction significantly. Therefore, a sudden expansion (similar to 6%) occurs, resulting in severe deformation of the samples. The shape retention ability of the sample can be improved by isothermally treating the sample at a proper temperature (470-490 degrees C) for prolonged time or heating it up at a low heating rate. Under these sintering conditions, the reaction between Ni and Al happens in a much more controllable solid-state way. Therefore, the abrupt expansion can be decreased to similar to 0.5%. During the solid-state reaction, imbalanced diffusion between Al and Ni results in more Al diffusing into Ni than the other way around, therefore creating pores on the Al side. As a result, homogeneous porous Ni3Al intermetallic samples can be fabricated and the regular shape of the sample can be well preserved.

Intermetallics Porous material Diffusion Powder metallurgy Reaction synthesis

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Committee in China[SGLH20161212155758670]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

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

WOS:000456760300008

ELSEVIER SCI LTD

20184706131411

Aluminum ; Binary alloys ; Diffusion ; Expansion ; Fabrication ; Heating rate ; Intermetallics ; Isotherms ; Nickel ; Nickel compounds ; Porous materials ; Powder metallurgy ; Sintering ; Solid state reactions

Metallurgy:531.1 ; Aluminum:541.1 ; Aluminum Alloys:541.2 ; Nickel:548.1 ; Heat Transfer:641.2 ; Chemical Reactions:802.2 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Jiang, Heng,Ye, Shulong,Ma, Rui,et al. Influences of sintering parameters on shape-retention ability of porous Ni3Al intermetallic fabricated by powder metallurgy[J]. INTERMETALLICS,2019,105:48-55.

Jiang, Heng,Ye, Shulong,Ma, Rui,&Yu, Peng.(2019).Influences of sintering parameters on shape-retention ability of porous Ni3Al intermetallic fabricated by powder metallurgy.INTERMETALLICS,105,48-55.

Jiang, Heng,et al."Influences of sintering parameters on shape-retention ability of porous Ni3Al intermetallic fabricated by powder metallurgy".INTERMETALLICS 105(2019):48-55.