Mouse Anti-Human CA 242 monoclonal antibody, clone 2C2

In the present work, the development of athermal epsilon martensite during quenching of a low carbon Ca-Cr-Mo alloy was investigated as a function of the grain size. In addition, a strain induced transformation (SIT)from fcc to hcp was exhibited during compressive plastic straining. It was found that grain size exerts a strong influence on the resultant volume fractions of athermal and strain induced epsilon martensite. In particular fine grain sizes inhibit the formation of athermal martensite while promoting appreciable volume fractions of epsilon martensite through the SIT mechanism. Moreover, X-ray diffraction analyses indicated that in 10 mu m grained structures the volume fraction of strain induced epsilon martensite reaches a saturation level of approximately 0.65 just before compressive fracture. In contrast. increasing grain sizes result in the formation of up to 0.9 volume fraction of SIT martensite Moreover the alloy yield strength was found to decrease down to 592 MPa (approximately half the yield strength of the as received alloy). Annealing gave rise to appreciable improvements in the compressive strength (242 MPa) and ductility (0.41) when compared with the as received alloy (2141 MPa and 0.295 respectively). The alloy hardness initially drops from 42 to 29 HRC as the grain sizes increase from 10 to 90 mu m. A further reduction in allay hardness did not occur for grain sizes between 90 and 324 mu m. Compression straining did not have a significant effect on the exhibited hardness of the as received alloy and only a model ate effect was found in coarse grained alloys. Alloys with grain sizes of 117 mu m exhibited an increase in hardness from roughly 29 to 46 HRC through compression straining up to 0.407. Probable mechanisms are considered to account for the role of grain size an the development of athermal and SIT epsilon martensite.

X-band E.P.R and also the far infrared spectra of alkoxy-bridged dimeric copper(II)complexes of 2-aminopyridine and pentane-2,4-dionate were recorded and the two sets of data thus obtained have been correlated. The E.P.R spectra were analysed in terms of an axial(S=1)spin Hamiltonian.Zero-field splitting parameter (D) was calculated for each complex and an attempt was made in order to correlate the obtained values with the magnetic coupling constants(J)of some compounds with analogous structures. An assignment has been made of the bands related to the centeral Cu2O2 bridging skeleton and the observed similarity in the frequency magnitude of a strongly CuOCu angle dependent mode has been proposed to arise from nearly equal angles in the seri of complexes. The correlative results indicated in the above have therefore enabled the identification of a ferromagnetic exchange mechanism in the seri of complexes with J values larger than 242.5 ca-1.