| Sample | Nanoindentetion test | |
| Reduced modulus [GPa] | Elastic modulus [GPa] | |
| As prepared | 5.55 | 4.89 |
| Heat-treatment @ 120˚C, 30 min | 2.96 | 2.60 |
| Additional heat-treatment @ 90˚C, 24 h | 4.65 | 4.10 |