Effects of Mo/B Atomic Ratio on the Mechanical Properties and Structure of Mo2NiB2 Boride Base Cermets with Cr and V Additions
✍ Scribed by Ken-ichi Takagi; Yuji Yamasaki
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 330 KB
- Volume
- 154
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The e4ects of Mo/B atomic ratio ranging from 0.8 to 1.5 (Mo contents) on mechanical properties and phase formation were studied for cermets with the composition of Ni+5.0B+xMo+ 3.5Cr+11.5V (wt%). A strong correlation between mechanical properties and phase formation was observed in the cermets. The cermets with somewhat higher stoichiometric Mo content, i.e., Mo/ B ratios of 1.1 and 1.2, showed a very 5ne ideal two-phase microstructure with a homogeneous distribution of a tetragonal Mo 2 NiB 2 (M 3 B 2 )-type complex boride in a solution-strengthened Ni base binder and hence exhibited an excellent transverse rupture strength (TRS) of more than 2.7 GPa and hardness of about 88 R A . In the cermets with low and high Mo/B ratios, another type of a complex boride, which was an orthorhombic M 3 B 2 or a tetragonal M 5 B 3 boride, was detected and was considered to deteriorate TRS due to a coarse-grained microstructure. 2000 Academic Press