Hardness and elastic properties of Ti(CxN1−x), Zr(CxN1−x) and Hf(CxN1−x) Export

@article{citeulike:3703084, abstract = {Here we report for the first time experimental results of the nanohardness and elastic properties (Young's modulus, shear modulus, bulk modulus) of well-characterised complete series of bulk Ti, Zr and Hf carbonitrides, Ti(C N ), Ti(C N ) , Zr(C N ) and x 12x x 12x 0.81 x 12x Hf(C N ), as a function of the carbon/ nitrogen ratio measured by continuous nano-indentation test and an ultrasonic technique. A x 12x correlation between elastic constants and porosity of TiC and TiN was obtained and used to correct elastic constants for the zero-porosity state. Recently, band structure calculations for transition metal carbonitrides yielded a maximum of the shear modulus of Ti and Hf carbonitrides at a valence electron concentration (VEC) of {\o}8.4 and {\o}8.2, respectively. These results were used to explain the hardness maximum of carbonitrides, which was considered as a success of theoretical material design. For the stoichiometric carbonitrides we indeed found—though much weaker than predicted—the maximum at [C] /([C]1[N]){\o}0.6–0.8 (VEC{\o}8.4–8.2) of the shear modulus, but neither the nanohardness nor the microhardness show a corresponding maximum. Thus the conclusion of a correlation of hardness and shear modulus is inapplicable for this type of hard materials.}, author = {Yang, Q.}, citeulike-article-id = {3703084}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/S0925-8388(00)01057-4}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0925-8388(00)01057-4}, day = {14}, doi = {10.1016/S0925-8388(00)01057-4}, issn = {09258388}, journal = {Journal of Alloys and Compounds}, keywords = {hfc, hfn, tic, ticn, tin, vec, zrc, zrn}, month = {September}, number = {1-2}, pages = {L5--L9}, posted-at = {2008-11-26 13:41:00}, priority = {0}, title = {Hardness and elastic properties of Ti(CxN1−x), Zr(CxN1−x) and Hf(CxN1−x)}, url = {http://dx.doi.org/10.1016/S0925-8388(00)01057-4}, volume = {309}, year = {2000} }

TY - JOUR ID - citeulike:3703084 L3 - citeulike-article-id:3703084 N2 - Here we report for the first time experimental results of the nanohardness and elastic properties (Young’s modulus, shear modulus, bulk modulus) of well-characterised complete series of bulk Ti, Zr and Hf carbonitrides, Ti(C N ), Ti(C N ) , Zr(C N ) and x 12x x 12x 0.81 x 12x Hf(C N ), as a function of the carbon/ nitrogen ratio measured by continuous nano-indentation test and an ultrasonic technique. A x 12x correlation between elastic constants and porosity of TiC and TiN was obtained and used to correct elastic constants for the zero-porosity state. Recently, band structure calculations for transition metal carbonitrides yielded a maximum of the shear modulus of Ti and Hf carbonitrides at a valence electron concentration (VEC) of ø8.4 and ø8.2, respectively. These results were used to explain the hardness maximum of carbonitrides, which was considered as a success of theoretical material design. For the stoichiometric carbonitrides we indeed found—though much weaker than predicted—the maximum at [C] /([C]1[N])ø0.6–0.8 (VECø8.4–8.2) of the shear modulus, but neither the nanohardness nor the microhardness show a corresponding maximum. Thus the conclusion of a correlation of hardness and shear modulus is inapplicable for this type of hard materials. IS - 1-2 JF - Journal of Alloys and Compounds SN - 09258388 EP - L9 TI - Hardness and elastic properties of Ti(CxN1−x), Zr(CxN1−x) and Hf(CxN1−x) VL - 309 SP - L5 KW - hfc KW - hfn KW - tic KW - ticn KW - tin KW - vec KW - zrc KW - zrn AU - Yang, Q PY - 2000/09/14/ UR - http://dx.doi.org/10.1016/S0925-8388(00)01057-4 ER -