Doppler broadening positron annihilation measurements of lattice defects during transformation cycling in Cu-Zn-Al alloy
- China Univ. of Mining and Tech., Jiangsu (China). Dept. of Mechanical Engineering
- Dalian Univ. of Technology (China). Dept. of Materials Engineering
- Florida International Univ., Miami, FL (United States). Dept. of Mechanical Engineering
Positron Annihilation Techniques have been proved to be a characteristic tool in the research of lattice defects in metals and alloys. Especially, vacancy type point defects and dislocations can be detected. During recent years, researchers have completed Doppler broadening and positron lifetime measurements to study the phase transformations and behavior of vacancies in CuZnAl, CuAlNi, CuAlMn and NiTi shape memory alloys. Also, research has demonstrated that positrons are sensitive to the evolution of defects, during aging and thermal cycling. From common knowledge, the authors know that copper base shape memory alloys contain a high concentration of excess vacancies once the alloys are quenched from the high temperature single beta phase. Also, the excess vacancies play a very important role in the complicated aging effects of both the parent and martensite phases. The present work intends, by means of Doppler broadening positron annihilation measurements, to investigate the behavior of quenched-in vacancies and the evolution of defects during martensitic transformation cycling.
- OSTI ID:
- 6153045
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:6; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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