✦ LIBER ✦

Tensile properties and microstructures of NiAl-20TiB2 and NiAl-20TiC in situ composites

✍ Scribed by J.T Guo; D.T Jiang; Z.P Xing; G.S Li

Publisher: Elsevier Science
Year: 1997
Weight: 538 KB
Volume: 18
Category: Article
ISSN: 0261-3069
DOI: 10.1016/s0261-3069(97)00077-0

No coin nor oath required. For personal study only.

✦ Synopsis

A hot-pressing aided exothermic synthesis HPES technique was developed to fabricate NiAl matrix composites reinforced with TiB and TiC particles which were in situ reaction synthesized from 2 elemental powders. These particles were uniformly dispersed in the matrix. The resulting products were hot isostatically pressed to nearly complete densification. It was found that the tensile yield strengths of the composites at 900ЊC were about two times stronger than that of unreinforced NiAl and were approximately three times stronger at 980ЊC. The interfaces between NiAl and TiC or TiB were 2 atomically flat, sharp and free from any interfacial phases in most cases, however, a thin interfacial amorphous layer or overlapped interfacial layer was observed at the interfaces in some cases. This type of interfacial structure may be beneficial to the strength of the composites.

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