Evaluation of Cyclic Behavior of Aircraft Turbine Disk Alloys

An evaluation of the cyclic behavior of three aircraft engine turbine disk materials was conducted to compare their relative crack initiation and crack propagation resistance. The disk alloys investigated were Inconel 718, hot isostatically pressed and forged powder metallurgy Rene '95, and as-hot-isostatically pressed Rene '95. The objective was to compare the hot isostatically pressed powder metallurgy alloy forms with conventionally processed superalloys as represented by Inconel 718. Cyclic behavior was evaluated at 650 C both under continuously cycling and a fifteen minute tensile hold time cycle to simulate engine conditions. Analysis of the test data were made to evaluate the strain range partitioning and energy exhaustion concepts for predicting hold time effects on low cycle fatigue

4-{[5-(4-Chloro­phen­yl)-1-(4-fluoro­phen­yl)-1H-pyrazol-3-yl]carbon­yl}-N-ethyl­piperazine-1-carboxamide

The asymmetric unit of the title compound, C23H23ClFN5O2, contains two crystallographically independent mol­ecules. In one mol­ecule, the pyrazole ring makes dihedral angles of 43.93 (7) and 35.82 (7)°, respectively, with the fluoro- and chloro-substituted benzene rings, while the corresponding angles in the other mol­ecule are 52.26 (8) and 36.85 (7)°. The piperazine rings adopt chair conformations. In the crystal, adjacent mol­ecules are connected via inter­molecular N—H⋯O, C—H⋯F, C—H⋯N and C—H⋯O hydrogen bonds, forming a two-dimensional network parallel to the bc plane. The crystal structure is further stabilized by a weak π–π inter­action with a centroid–centroid distance of 3.6610 (8) Å and by C—H⋯π inter­actions

1,3-Dimethyl-4-phenyl­sulfanyl-1H-pyrazol-5-ol

In the title compound, C11H12N2OS, the pyrazole ring makes a dihedral angle of 85.40 (8)° with the phenyl ring. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds link mol­ecules into a two-dimensional network parallel to the bc plane

4-{2-[5-(4-Chloro­phen­yl)-1-(4-fluoro­phen­yl)-1H-pyrazol-3-yl]thia­zol-4-yl}benzonitrile

The asymmetric unit of the title compound, C25H14ClFN4S, contains two independent mol­ecules (A and B). Each mol­ecule consists of five rings, namely chloro­phenyl, fluoro­phenyl, 1H-pyrazole, thia­zole and benzonitrile. In mol­ecule A, the 1H-pyrazole ring makes dihedral angles of 52.54 (8), 35.96 (8) and 15.43 (8)° with respect to the attached chloro­phenyl, fluoro­phenyl and thia­zole rings. The corresponding values in mol­ecule B are 51.65 (8), 37.26 (8) and 8.32 (8)°. In the crystal, mol­ecules are linked into dimers by C—H⋯N hydrogen bonds, generating R 2 2(10) ring motifs. These dimers are further linked into two-dimensional arrays parallel to the ab plane via inter­molecular weak C—H⋯N and C—H⋯F hydrogen bonds. The crystal structure is further stabilized by weak π-π inter­actions [with centroid–centroid distances of 3.4303 (9) and 3.6826 (9) Å] and weak C—H⋯π inter­actions

4-Methyl-5-phenyl-1H-pyrazol-3-ol

The title compound, C10H10N2O, crystallizes with two independent mol­ecules in the asymmetric unit, having closely comparable geometries. The dihedral angles between the 1H-pyrazole and benzene rings in the two mol­ecules are 39.57 (14) and 41.95 (13)°. The two mol­ecules are each connected to neighbouring mol­ecules by pairs of inter­molecular O—H⋯N hydrogen bonds, forming dimers with R 2 2(8) ring motifs. These dimers are further linked into R 4 4(10) ring motifs by inter­molecular N—H⋯O hydrogen bonds, forming chains along [101]. The crystal structure is further stabilized by a C—H⋯π inter­action

3-(2,5-Dimethyl­furan-3-yl)-1H-pyrazol-5-ol–ethyl 3-(propan-2-yl­idene)carbazate (1/1). Corrigendum

Corrigendum to Acta Cryst. (2010), E66, o3020–o3021

1-{[5-(4-Chloro­phen­yl)-1-(4-fluoro­phen­yl)-1H-pyrazol-3-yl]carbon­yl]}piperidin-4-one

In the title compound, C21H17ClFN3O2, the 1H-pyrazole ring makes dihedral angles of 36.73 (7), 18.73 (7) and 60.88 (8)°, respectively, with the mean planes of the chloro­phenyl, 4-oxo­piperidine and fluoro­phenyl rings. The mol­ecular structure is stabilized by an intra­molecular C—H⋯N hydrogen bond, which forms an S(6) ring motif. In the crystal, inter­molecular C—H⋯O hydrogen bonds link mol­ecules into chains along [101]. In addition, inter­molecular C—H⋯F hydrogen bonds with an R 2 1(7) ring motif connect neighbouring chains into layers parallel to the ac plane

1-(4-Fluoro­phen­yl)-3-methyl-4-phenyl­sulfanyl-1H-pyrazol-5(4H)-one

The title compound, C16H13FN2OS, has undergone enol-to-keto tautomerism during the crystallization process. The 1H-pyrazole-5-one ring [maximum deviation = 0.0198 (11) Å] is inclined at angles of 33.10 (5) and 79.57 (5)° with respect to the fluoro­phenyl [maximum deviation = 0.0090 (12) Å] and phenyl­thiol [maximum deviation = 0.0229 (3) Å] rings attached to it. In the crystal, neighbouring mol­ecules are linked into inversion dimers, generating R 2 2(8) ring motifs. These dimers are further linked into two-dimensional arrays parallel to the bc plane via inter­molecular N—H⋯O, C—H⋯F and C—H⋯O hydrogen bonds. The crystal is further stabilized by weak π–π [centroid–centroid distance = 3.6921 (7) Å] and C—H⋯π inter­actions

5-Ethyl-4-methyl-1H-pyrazol-3(2H)-one

In the title compound, C6H10N2O, the 2,3-dihydro-1H-pyrazole ring is approximately planar, with a maximum deviation of 0.013 (1) Å. Pairs of inter­molecular N—H⋯O hydrogen bonds link neighboring mol­ecules into dimers, generating R 2 2(8) ring motifs. These dimers are further linked into two-dimensional arrays parallel to the bc plane by inter­molecular N—H⋯O hydrogen bonds. The crystal structure is further stabilized by C—H⋯π inter­actions

5-Pentyl-4-phenyl­sulfonyl-1H-pyrazol-3-ol

In the title compound, C14H18N2O3S, the 1H-pyrazole ring is approximately planar, with a maximum deviation of 0.005 (1) Å. The dihedral angle formed between the 1H-pyrazole and phenyl rings is 79.09 (5)°. Pairs of inter­molecular N—H⋯O and O⋯H⋯N hydrogen bonds form dimers between neighboring mol­ecules, generating R 2 2(10) ring motifs. These dimers are further linked by intermolecular N—H⋯O and O—H⋯N hydrogen bonds into two-dimensional arrays parallel to the ac plane. The crystal structure is also stabilized by C—H⋯π inter­actions