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  • 1
    Electronic Resource
    Electronic Resource
    Influence of Heat Treatment on Magnetic and Damping Properties of Fe-11 at.% Al Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 137 (Mar. 2008), p. 129-136 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The influence of heat treatment on the amplitude dependence of internal friction in Fe -11 at. % Al alloys with carbon contents in the range 0.005 - 0.2 at. % has been studied using aninverted torsion pendulum in the temperature range 300 – 950 K and a vibrating reed apparatus atroom temperature. The specimens were annealed at 1273 K in vacuum and cooled down withdifferent cooling rates in order to obtain different degrees of order. It was found that ordering ishardly avoidable in Fe - Al alloys with Al contents 〉 11 at. %. Ordered alloys are characterised bylower damping capacity due to higher coercivity caused by additional pinning of magnetic domainwalls by antiphase boundaries. X-ray diffraction investigations indicate that water-coolingsuppresses ordering in Fe - 11 at. % Al alloys while cooling in air or in furnace provokes D03–typeordering. Slowly cooled specimens are characterised by higher damping capacity due to lowercoercivity than water cooled or plastically deformed specimens. The amplitude dependentmagneto-mechanical damping was determined as the difference between amplitude dependentdamping without and with saturating magnetic field (~ 20 kA/m). Magneto-mechanical dampingwas found to be proportional to the strain where the amplitude dependent damping is maximumand reciprocal to the coercivity and saturation polarisation. Cold rolling increases the coercivityand therefore decreases the magneto-mechanical damping. An increase of the grain size in theinvestigated samples by heat treatment leads to a qualitatively expected decrease of coercivity andtherefore to an increase of magneto-mechanical damping
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.129.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Snoek-Type and Zener Relaxation in Fe-Si-Al Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 137 (Mar. 2008), p. 69-82 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Carbon-containing Fe - Si and Fe - Si - Al alloys were studied with respect to the carbonrelatedSnoek-type and Zener relaxation using different mechanical spectroscopy techniques. In allalloys the temperature-dependent profile of the Snoek peak, relative to that in pure iron, is modifiedon its high-temperature side by the substitutional atoms. At least two components, an Fe - C - Fe(which correspond to C atom jumps (diffusion) in areas where it is surrounded by Fe atoms only)and Fe - C - Me peaks, where Me = Si, Al, can be distinguished in the Snoek-peak profile. In bothbinary Fe - Al and Fe - Si and ternary Fe - Si - Al alloys, a higher annealing temperature prior toquenching leads to an increase in the Fe - C - Fe and a decrease in the Fe - C - Me component ofthe Snoek peak. Heating to 1173K and above often lowers the peak height due to thermal vacancies.Low-temperature (〈670K) ageing of quenched Fe - Si - Al and Fe – Si specimens reduces both theFe – C - Fe and Fe – C – Al / Si peaks. Ageing at T 〉 670 K changes the temperature- as well as theamplitude-dependent parts of internal friction due to a redistribution of carbon between solidsolution and dislocations. Both the Snoek-type peak height and the dislocation mobility – as can beconcluded from the slope of the amplitude-dependent internal friction – increase, and a new peakappears at temperatures higher than that of the Snoek peak, which probably is a Snoek-Köster peakresulting from the motion of weakly pinned dislocations. A Zener peak appears if the concentrationof substitutional atoms is 〉 6 at. %. The Zener peak relaxation strength is much lower in ternaryalloys than in the binary ones probably due to mutual compensation of elastic distortions inpresence of Al and Si atoms which are bigger and smaller, respectively, than Fe atoms
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.69.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of the fenugreek (Trigonella foenum-graecum L.) genotypes for fresh weight, seed productivity, symbiotic activity, callus formation and aceumulation of steroids (1996)
    Springer
    Euphytica 88 (1996), S. 129-138 
    Details
    ISSN: 1573-5060
    Keywords: Trigonella foenum-graecum ; fenugreek ; fresh weight ; seed yield ; Rhizobium meliloti ; nodules ; symbiotic efficiency ; calli ; steroid glucosides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary As a result of the analysis of 31 fenugreek (Trigonella foenum-graecum L.) genotypes we demonstrated that subsp. indica surpass significantly subsp. foenum-graecum in fresh weight, seed yield, nodulation ability, resistance to coot rot and the duration of the interstage and growing periods. There was no difference between the subspecies for leafiness and biochemical composition of seeds (concentrations of diosgenin and steroid glucosides, nitrogen, fat, inhibitors of tripsin and hemotripsin). The most promising genotypes (as compared with the standard cv. Nakhichevanskaya Shambala) yield 1650–1938 g/m2 of fresh weight, 98.2–116.1 g/m2 of seeds and accumulate 1.45–1.64% of diosgenin in seeds. High positive correlations (r=+0.53 ... +0.84; Po〈0.01) were found between fresh weight, seed yield, plant leafiness and height. Inoculation of the cv. Nakhichevanskaya Shambala with Rhizobium meliloti strains 851 and 852 increased its fresh weight by 94.5% and 93.6% and seed yield by 83.1% and 60.5%, respectively. Significant correlations of the nodule number with the fresh weight and seed yield (r=+0.70 and +0.77; Po〈0.01) allow us to assume that selection for increased symbiotic activity may be useful for improving the fenugreek productivity. The intersubspecies hybrids (four genotypes) surpass the subsp. indica (six genotypes) for the sizes of calli formed in presence of 2.4-D and kinetin. The sizes of calli formed by ten analysed genotypes in presence of BAP and kinetin (or 2.4-D) were negatively correlated with the nodule number (or fresh weight).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032444
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