어닐링 열처리 조건에 따른 NITINOL 형상기억합금의 상변환 특성 연구
Effects of Annealing Heat Treatment Conditions on Phase Transformation of Nitinol Shape Memory Alloy
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초록
본 연구에서는 시차주사열량분석장치와 X-선 회절장치를 이용하여 어닐링 열처리 조건에 따른 니티놀 형상기억합금의 상변환 특성과 결정구조를 조사하였다. 어닐링 열처리 조건으로는 열처리 시간과 열처리 온도를 고려하였으며 특히 열처리 시간은 5분, 15분, 30분, 45분 그리고 열처리 온도는 400℃, 500℃, 525℃, 550℃, 575℃, 600℃, 700℃, 800℃, 900℃를 적용하였다. 연구결과에 따르면 열처리 시간과 열처리 온도 등의 어닐링 열처리 조건은 니티놀 형상기억합금의 상변환 특성과 결정구조에 큰 영향을 미침을 알 수 있었다.
Abstract
Phase transformation behaviors and crystal structures of Nitinol shape memory alloy (54.5Ni-45.5Tiwt%) are investigated by varying annealing heat treatment conditions through DSC (Differential Scanning Calorimetry) and XRD (X-Ray Diffraction). Annealing heat treatment conditions were considered as heat treated times of 5min, 15min, 30min, and 45min, as well as heat treated temperatures of 400℃, 500℃, 525℃, 550℃, 575℃, 600℃, 700℃, 800℃, and 900℃. According to the results, annealing heat treatment conditions such as heat treated times and heat treated temperatures were found to affect significantly on phase transformation behaviors and crystal structures of Nitinol shape memory alloy.
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