NIST Standard Reference Database 30
Last Update to Data Content: 2002
"Thermal and Mechanical Properties of Neutron-Irradiated Aluminum Nitride," T. Yano and T. Iseki, Journal of Nuclear Materials, Vol. 179, pp. 387-390 (1991), published by Elsevier Science B.V..Language: English
"The specimen used as >99.5% AlN, kindly supplied by the Tokuyama Soda Co., Japan. The sintered density is 3.25 g/cm3 which is 99% of the theoretical density. ... Two types of specimens, bar (2 x 4 x 25 mm3) and disc (10 mm diameter and 2 mm thickness), were irradiated to fast neutron fluences up to 5.2 x 1024 m-2 (E > 1 MeV) in the Japan Materials Testing Reactor (JMTR) in a He encapsulated container. The irradiation induced macroscopic length change was measured using a point type micrometer at room temperature."
"Lattice parameters were determined by means of powder X-ray diffractometry (XRD), using Si (a = 0.543088 nm) as an internal standard at room temperature."Four-point bend test
"Four-point bending strength (5 tests for each point) was obtained under the following conditions; upper span 10 mm, lower span 20 mm and crosshead speed 0.5 mm/min. The specimen was proof-tested before irradiation for 10 s at 275 MPa."Vickers indentation
The authors cite K. Niihara et al., J. Mater. Sci. Lett., Vol. 1, 13 (1982), and summarize the procedure as follows. "The hardness of specimens was obtained using a Vickers hardness tester with a loading weight of 5 kg for 15 s. The fracture toughness was estimated by an indentation microfracture method under the same loading condition as hardness measurement."Laser flash technique
"The laser flash method was used to measure the thermal diffusivity of the specimen at room temperature. Thermal conductivity, k (W/(m·K)) was obtained from the formula, k = αCpd, where α is thermal diffusivity (m2/s), Cp is the specific heat (J/g K) and d the density (g/m3). Cp was fixed as 0.662 J/g K."
| Axis | Neutron Fluence ( 1022 m2 ) | Volume Swelling ( % ) | Axis Length ( Å ) |
|---|---|---|---|
| a | 0 | 0.00 | 3.1114 |
| a | 8.3 | 0.32 | 3.1144 |
| a | 240 | 0.63 | 3.1131 |
| a | 520 | 0.44 | 3.1121 |
| c | 0 | 0.00 | 4.9798 |
| c | 8.3 | 0.32 | 4.9844 |
| c | 240 | 0.63 | 5.0059 |
| c | 520 | 0.44 | 4.9987 |
| Relative Density ( % ) | Density ( g cm-3 ) |
|---|---|
| 99 | 3.25 |
| Volume Swelling ( % ) | Flexural Strength ( MPa ) |
|---|---|
| 0.00 | 354±11 |
| 0.32 | 309±11 |
| 0.44 | 303±17 |
| 0.63 | 274±6 |
Data were digitized from Fig. 1 of the reference.
| Volume Swelling ( % ) | Fracture Toughness ( MPa m1/2 ) |
|---|---|
| 0.00 | 1.7 |
| 0.32 | 4.4±0.2 |
| 0.44 | 4.7±0.5 |
| 0.63 | 5.1±0.3 |
Data were digitized from Fig. 2 of the reference.
| Volume Swelling ( % ) | Hardness ( GPa ) |
|---|---|
| 0.00 | 9.2 |
| 0.32 | 12.9±0.4 |
| 0.44 | 15.0±0.4 |
| 0.63 | 15.6±0.4 |
Data were digitized from Fig. 2 of the reference.
| Volume Swelling ( % ) | Thermal Conductivity ( W m-1 K-1 ) |
|---|---|
| 0.00 | 168 |
| 0.32 | 32 |
| 0.63 | 26 |
Data were digitized from Fig. 3 of the reference.
| Volume Swelling ( % ) | Thermal Diffusivity ( cm2 s-1 ) |
|---|---|
| 0.00 | 0.78 |
| 0.32 | 0.14 |
| 0.63 | 0.11 |
Data were digitized from Fig. 3 of the reference.