ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Dynamic behavior of two types of martensitic transformations during tensile deformationof Cu-Al-Ni shape memory alloy single crystal has been investigated using an acoustic emissionwaveform analysis. Two kinds of martensitic transformations consist of β1 ⇔ β1′ (structural changeof DO3 to 18R) and β1 ⇒ γ1′ (structural change of DO3 to 2H), each of which is called super-elasticand thermo-elastic martensitic transformations, respectively. These two types of martensitictransformations could be obtained during tensile deformation because of different heat treatment.The rise time at the source (the source rise time) in finite elastic solid by the modified Takashima’smethod was analyzed using the acoustic emission waveform detected during the martensitictransformation. The mean source rise time to the γ1′ phase was smaller than that to the β1′ phasebefore yielding and became the same after yielding. The former result means that the nucleation ofthe γ1′ phase is faster than that of the β1′ phase because of different crystallographic structure. Thelatter result is that the growth rate of the γ1′ phase is the same as that of the β1′ phase
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.13-14.305.pdf
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