Influence of Interstitials on the mechanical properties of group IV b metals

THE spectacular progress in nuclear technology and space science researches has brought in a vigorous inte-rest in the properties of IV b metals, titanium, zir- conium and hafnium and their alloys. In most of the engineering applications, the properties of pure metals themselves would be clearly insufficient:alloying with other elements would be called for, be it for increase in strength and fracture toughness, or for better super conducting properties. Group IV b metals are somewhat unique in their alloying behaviour as they form solid solutions not only with substitutional alloying additions, but also rather extensively with interstitial elements hydrogen, carbon, oxygen and nitrogen. Generally, these elements are not soluble to any remarkable degree in metals and they readily form second phase compounds when present over few parts per million. IV b metals, perhaps helped by their crystal structure and accompanying large interstices, are able to accommodate these elements in their original lattices themselves, thus leading to dras-tic alterations in their mechanical and physical prop-erties. It is the purpose of this review to consider the influence of interstitials on the mechanical properties of group IV b metals. This must be of recurrent interest to those engaged in investigations connected with the metallurgy of Ti, Zr and Hf and their alloys

Influence of Interstitials on the Mechanical Properties of Group IVb Metals

This review is concerned with the role of interstit-ials hydrogen, oxygen, nitrogen and carbon in the mechani-cal behaviour of titanium, zirconium and hafnium. This is of recurrrent interest as these metals form rather exte-nsive solid-solutions with most of the interstitials, which in turn alter the mechanical properties of the alloys significantly

Science and technology in agricultural development - a key to the future

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Assessment of genetic potential of multiple crosses in Triticale.

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Maternal repair system- an analysis in retrospect

Influence of caffeine, cysteine, hydroxyures and cycloherimide on maternal repair system operative in female Drosophila was studied using rod-X males and Oster females. The number of parental matings was kept constant. A new method of statistical analysis was employed to examine the frequency of sex-chromosome loss in these experiments. A re-analysis of published data was also done using this method. The existence of a maternal repair system was not upheld. The observed discrepancies between data reported herein and those published earlier and the possible reasons are discussed

Genetic studies on mote index, pollen sterility and earliness in interspecific cotton hybrids

Hybrids between four divergent varieties of Gossypium hirsutum and eight of G. barbadense were evaluated for three components of commercial importance, mote index, pollen sterility and earliness in their F1 generation. It was found that the former two components were predominantly under the control of additive gene action. The studies brought out the possibilities of selecting for fertile and early-maturing hybrids with the incidence of motes. American Nectariless, K 3400 SB 289 E, SB 1095-6 were found to be desirable parents and the crosses of the former two as female with the letter two as male parents were found to possess all the desirable character

Genotype dependent response to Azospirillum treatment in yield and nitrogenase activity in Brassica juncea L.

Twelve advanced lines of mustard (Brassica juncea L.) were evaluated for response to treatment with Azospirillum brasilense in yield and a few components. Two lines gave yield increases with concomitant increases in nitrogenase activity and Azospirillum population. In general, there were desirable and significant correlations between plot yield, nitrogenase activity and log, (Azospirillum population). The results point to the possibility of utilizing genotype-dependent response to Azospirillum in breeding programmes and also for exploring new avenues of Azospirillum-based cultural practices in sustaining improved productivity

Seed nitrogen and fatty acids reflecting yield variation in groundnut (Arachis hypogaea)

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Genetic analysis of some exotic x Indian crosses in sorghum. VI. Dynamics of character association under selection

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Genetic potential of artificially synthesized Brassica juncea for yield improvement

A study was made to compare the potential of artificially synthesized Brassica juncea strains in inter-varietal crosses for basal branching characters and seed yield. Sixty four F3 families of synthetic x synthetic, synthetic x cultivar, and cultivar x cultivar crosses were studied and from among them thirty two superior F3 families were selected and advanced to F4 generation. Artifically synthesized materials generate more useful variability than those by usual inter-varietal crosses