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KMID : 0647819990220020215
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Research Bulletin of Jinju Health College
1999 Volume.22 No. 2 p.215 ~ p.230
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Damping Properties of Casting Ti alloys and fabrication of Ti alloy Powders by using Mechanical Alloying Method
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Abstract
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Microstructure and phase transformation of mechanically alloyed Ti-Ni(CU) powders for enhancing the damping properties were studied. The mixtures of elemental powders (Ti-50Ni, Ti-45Ni-5Cu) were mechanically alloyed by high energy ball mill. Mechanically alloyed Ti-Ni(Cu) powder was heat treated at the temperature up to 850´C for 1 hour in the 10-6 torn vacuum atmosphere for the crystallization and phase transformation to martensite. Specific damping capacity (SDS) using cantilever beam method was obtained by using a dynamic strain amplifier.
The results obtained were as follows;
1. TiNi(Cu) shape memory alloy powders were fabricated by mechanical alloying. So, the mixtures of elemental powders( Ti-50Ni and Ti-45Ni-5Cu) were mechanically alloyed(MA). MA was to engaged for 10 hours were formed amorphous phase and particles refinement.
2. Amorphous phase was crystallized to martensite(B19´ )and.austenite(B2) after heat treating for 1 hour at the temperature at 8501C, and TiN13 intermetallic compound was partially formed.
3. Specific damping capacity of Ti, Ti-50NIi and Ti-45Ni-5Cu casting alloys was related with the amount of martensite phase and the best result of damping capacity was Ti-45Ni-5Cu casting material.
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KEYWORD
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