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급냉 응고된 Al합금의 열처리에 따른 미세구조 및 기계적성질에 관한 연구
서동수,조성석,신용덕,김혜성,임승무 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.2
Rapidly solidified A2024 alumium alloy plate and powder produced by the twin-roll method and the centrifugal atomization method, respectively. The microstructure and shape of the specimen were closely related to the process parameters. The process parameters of the twin-roll method must be properly combined in order to manufacture defect-free plate. Four kinds of powder shape were produced by the centrifugal atomization process, e.g. spherical, tear drop, ligamental and flake. The age hardening behavior of the rapidly solidified A2024 alloy was somewhat different from the conventional slowly solidified one.
원심분무법에 의한 고강도 7XXX 알루미늄 합금 분말의 제조
이태행,임승무,조성석 ( Tae Hang Lee,Seong Moo Im,Sung Suk Cho ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.6
N/A 7XXX aluminum alloy powders produced by the self-manufactured rotating disc atomizer were investigated to determine the influence of the atomization parameters on the particle size distributions in air atmosphere. The particle size distributions are almost always bimodal with the dominant mode on the large particle size. Average powder size of 7XXX aluminum alloy is 74/㎛∼125/㎛ when melt is poured with the rate of 9g /sec at 730℃ on a rotating disc of 30㎜ diameter at 6300rad /sec. The mass of finer particle increased when disc diameter, angular velocity, pouring temperature increased and pouring rate decreased. The powder shapes of bimodal change from acicular to tear-drop and from tear-drop to ligament with increasing powder size. Powder shape was determined by the atomization mechanism and oxidation in liquid state. Microstructure of powders appeared to be cell and cellular dendrite. The SDAS of Al-7.9wt%Zn-2.4wt%Mg-1.5wt%Cu-0.9wt%Ni Powders is 0.8㎛∼1.0㎛ for the powders of size+44㎛∼53㎛ and 1.6㎛∼1.8㎛ for the powders of size+105㎛∼125㎛, repectively.