Investigation into the thermal behaviour of the B2-NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders

被引：22
作者：
Camagu, S. T. [1 ,2 ]
Mathabathe, N. M. [2 ]
Motaung, D. E. [1 ,3 ]
Muller, T. F. G. [1 ]
Arendse, C. J. [1 ]
Bolokang, A. S. [1 ,2 ]
机构：
[1] Univ Western Cape, Dept Phys, POB 339,Private Bag X 17, ZA-7535 Bellville, South Africa
[2] CSIR, Mfg Cluster, Light Met, Meiring Naude Rd,POB 395, Pretoria, South Africa
[3] CSIR, Natl Ctr Nanostruct Mat, DST, ZA-0001 Pretoria, South Africa
来源：
VACUUM | 2019年 / 169卷
关键词：
B2-NiAl; Brittle; Cubic; Intermetallic; EBSD; MECHANICAL-PROPERTIES; OXIDATION RESISTANCE; COMBUSTION SYNTHESIS; NANOPARTICLES; COMPOSITE; COMPOUND;
D O I：
10.1016/j.vacuum.2019.108919
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A cubic B2-NiAl alloy was synthesized by mixing of elemental Ni and Al powders followed by cold compacting and sintering of some samples at 750 degrees C and other samples at 1300 degrees C. The alloys sintered at 1300 degrees C exhibited a brittle B2-NiAl structure easily crushable into powder, while the 750 degrees C sintered alloys were not nearly as brittle. Electron Backscatter Diffraction (EBSD) results show that the B2-NiAI alloy sintered at 750 degrees C for a longer time (120 h) has larger grain size associated with the < 111 > -oriented grains encountering high mobility boundaries than the alloy sintered at 750 degrees C for a shorter time (48 h). Samples morphologies were analyzed using the Scanning Electron Microscope (SEM). Structural development of the alloy was studied via the x-ray diffraction (XRD) technique. The B2-NiAl intermetallic developed a thin scale of stable Al2O3 alloy due to oxidation in air at 750 degrees C for 120 h. As a result, further oxidation on the samples surface was restricted, except the traces of Al2O3 formed via intergranular oxidation transformed into a metastable monoclinic oxynitride phase due to nitrogen (N) contamination.
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页数：12
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