NIST Standard Reference Database 30
Last Update to Data Content: 2002
"Effect of Residual Nickel Content on the Grain Size Dependent Mechanical Properties of TiB2," P.F. Becher, C.B. Finch, and M.K. Ferber, Journal of Materials Science Letters, Vol. 5, pp. 195-197 (1986), published by Chapman and Hall.Language: English
"Hot pressed compacts (4 cm in diameter by 1 cm thick) were prepared from the air-classified fine (5 µm) and coarse (12 µm) fractions of carbothermic TiB2 powder (about 1 wt% O2), dry mixed with 10 wt% carbonyl nickel powder (5 µm). Using separate runs, the hot pressing duration was progressively extended from 0.5 h to 32 h, while the other hot pressing variables were held constant (12 MPa load, vacuum, graphite die, 1425 °C). ... The residual nickel contents of the final compacts made from either the fine or coarse fraction of TiB2 powder were determined by the average of at least 20 ion microprobe determinations (30 µm diameter beam) taken at different positions on polished cross sections."
"Specimens were characterized using an ultrasonic technique to obtain Young's modulus and Poisson's ratio." No additional measurement details were noted.Four-point bend test
"Fracture strengths were determined by fracturing for at least six 2.5 mm x 2.5 mm x ≥20 mm bars for each sample in the four-point bending mode (6.35 mm and 19.05 mm inner and outer spans), with an Instron testing machine operating at a crosshead speed of 0.042 mm/s."Toughness test
The authors cite R.F. Cook et al., J. Am. Ceram. Soc., Vol. 66, C-200 (1983), and summarize the procedure as follows. "At least five fracture toughness values per sample were determined either by introducing multiple indent flaws in the polished tensile surface of bend bars and then fracturing the bars or by the applied moment double cantilever beam technique."
| Mass Fraction of Ni ( % ) | Density ( g/cm3 ) | Grain Size ( µm ) | Elastic Modulus ( GPa ) |
|---|---|---|---|
| 4.6 | 4.28 | 4.8 | 411 |
| 1.5 | 4.51 | 5.3 | 564 |
| 1.0 | 4.50 | 5.5 | 557 |
| 0.4 | 4.48 | 5.2 | 561 |
| 8.5 | 4.28 | 11.0 | 365 |
| 1.3 | 4.28 | 10.8 | 578 |
| 0.2 | 4.52 | 12.8 | 572 |
| 0.1 | 4.51 | 14.4 | 578 |
| Mass Fraction of Ni ( % ) | Density ( g/cm3 ) | Grain Size ( µm ) | Flexural Strength ( MPa ) |
|---|---|---|---|
| 1.5 | 4.51 | 5.3 | 710 |
| 1.0 | 4.50 | 5.5 | 624 |
| 0.4 | 4.48 | 5.2 | 500 |
| 1.3 | 4.63 | 10.8 | 450 |
| 0.2 | 4.52 | 12.8 | 310 |
| 0.1 | 4.51 | 14.4 | 280 |
| Mass Fraction of Ni ( % ) | Density ( g/cm3 ) | Grain Size ( µm ) | Fracture Toughness ( MPa m1/2 ) |
|---|---|---|---|
| 1.5 | 4.51 | 5.3 | 6.8 |
| 1.0 | 4.50 | 5.5 | 5.2 |
| 0.4 | 4.48 | 5.2 | 5.1 |
| 1.3 | 4.63 | 10.8 | 6.1 |
| 0.2 | 4.52 | 12.8 | 4.5 |
| 0.1 | 4.51 | 14.4 | 3.9 |
| Mass Fraction of Ni ( % ) | Density ( g/cm3 ) | Grain Size ( µm ) | Poisson's Ratio ( no unit ) |
|---|---|---|---|
| 4.6 | 4.28 | 4.8 | 0.119 |
| 1.5 | 4.51 | 5.3 | 0.091 |
| 1.0 | 4.50 | 5.5 | 0.106 |
| 0.4 | 4.48 | 5.2 | 0.104 |
| 8.5 | 4.28 | 11.0 | 0.102 |
| 1.3 | 4.63 | 10.8 | 0.115 |
| 0.2 | 4.52 | 12.8 | 0.099 |
| 0.1 | 4.51 | 14.4 | 0.097 |