마그네슘합금내 개재물 함유량에 따른 파단면의 명도변화

• Published in: 한국주조공학회지 Vol. 34; no. 6; pp. 200 - 213
• Main Authors: 김현식, Hyun Sik Kim, 예대희, Dea Hee Ye, 강민철, Min Cheol Kang, 김정대, Jung Dae Kim, 정해용, Hae Yong Jeong
• Format: Journal Article
• Language: Korean
• Published: 한국주조공학회 31.12.2014
• Subjects: Evaluation; Inclusion; Oxide; Recycled ingot; Virgin magnesium; 금속공학; Oxide; Recycled ingot; Evaluation; Inclusion; Virgin magnesium
• ISSN: 1598-706X; 2288-8381
• DOI: 10.7777/jkfs.2014.34.6.200

Pure magnesium and magnesium alloys have been applied to various kinds of industrial fields, especially automotive and electronic parts. These parts are manufactured mainly through a diecasting process. These days, magnesium ingots are used as raw material, and recycled ingots are often used for commercial purposes. But the quality of virgin magnesium and recycled ingots is not secure. Therefore, massive casting defects can occur, and some things manufactured can be damaged by these defects. This study evaluated the inclusions of virgin magnesium and recycled ingot. It also included composition analysis by spectrometer, measuring inclusion contents by SEM & EDS, and performing a brightness test on fractured surfaces. The brightness test is generally very easy and obtains results quickly, so its results have been compared with the results obtained from various test methods. From the test results, we obtained a satisfactory result in evaluating inclusion and oxide. The brightness values are lower as the inclusion contents are higher. When the brightness value is over 47 in AM50A and 44 in AZ91D, the mechanical properties are expected to be good.