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  • 1
    Electronic Resource
    Electronic Resource
    Non-Differential Conduction Calorimeter, a Tool to Study the After Quench Behaviour in Shape Memory Alloys (1998)
    Springer
    Journal of thermal analysis and calorimetry 53 (1998), S. 671-683 
    Details
    ISSN: 1572-8943
    Keywords: conduction calorimeters ; martensitic transformation ; quench effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract After the development of differential conduction calorimeters realized by E. Calvet around 1946, the standard equipment always used a differential configuration. In home made systems for special purposes, the instrumentation available nowadays suggests that it is possible to use non-differential conduction calorimeters. In order to prove this, a simple and cheap design was constructed and tested. A sensitivity of 700 mV/W near 298 K (in agreement with the detecting semiconductors), a noise around 0.3 µW and a long time fluctuation of the base line lower than 1 µW were obtained. The reliability of the system was evaluated by analyzing the changes of single crystals of Cu-Zn-Al Shape Memory Alloys after different thermal treatments. The calorimeter allowed the determination of a reproducible set of time constants related to the heat treatments and to the mass (or shape) of the sample. It is concluded that the experimental configuration used is suitable for this isothermal analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010186621841
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calorimetry under Stress A Preliminary Study in Single Crystalline Cu-Zn-Al Shape Memory Alloys (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 247-259 
    Details
    ISSN: 1572-8943
    Keywords: martensitic transformation ; noise suppression ; non-differential conduction calorimetry ; phase transition ; single crystal ; signal processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A non-differential calorimetric analyzer was developed for an INSTRON 1123 machine (a stress-strain-temperature analyzer) with a temperature chamber INSTRON 1110. The study was performed using the Joule effect and pseudoelastic martensitic transformations in single crystals of Cu-Zn-Al alloys. The analysis of the system establishes that: the sensitivity of calorimetric measurements after a filter of two poles and two zeros is 166 mV W-1 (at 297 K), the noise is near 1.5 μV and the drift is close to 30 μV in 6 h. The reproducibility of the sensitivity working with one sample is better than ±0.3%, and the change to a new sample keeps the value below ±0.5%. The uncertainty in reproducibility in the martensitic transformation (including repositioning) does not overcome ±1.6%. The used calorimetric sensors limit the temperature to 373 K. The furnace control originated fluctuations on the base line (near ±20 μV), which by means of an auxiliary signal processing were reduced to 50% (less than ±10 μV).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010113609505
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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