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급냉 응고된 Al-Li-Cu합금의 열처리, 미세조직 및 기계적 성질에 관한 연구(I)
許明日,南勝義,李範圭,羅亨用,金錫胤 弘益大學校 1988 弘大論叢 Vol.20 No.2
Effect of aging condition on the microstructure and hardness properties of Al-3Li, Al-3Li-2Cu, Al-3Li-2Cu-0.3Zr have been studied. The alloy ribbons have been prepared by means of Single Roll Melt Spinning by rapid solidification technique. In rapidly solidified Al-3Li-2Cu, Al-3Li-2Cu-0.3Zr alloy ribbons show the icosahedral intermetallic compound of five-fold symmetry which is placed in cell-bound-ary and matrix. In the matrix precipitated fine δ'(Al₃Li) phase. Heat-treated at 250℃ 1hr. In this condition, δ'(Al₃Li) phase started decompose. The icosahedral intermetallic compound has been grown. When heat-treated at 300℃ 1 hr, the δ' phase has been decomposed all. In the matrix, icosahedral intermetallic compound has been grown greatly. The micro-hardness has been obtained more high Al-Li-Cu-(Zr) alloy than Al-Li alloy. Strength-hardended phenomena showed to solution hardning by the addition of Cu. When the heat-treated at 250℃ 1 hr, in the alloy of Zr addition, delayed decomposed δ' phase. In the case, micro-hardness gradually decreased. When the heat-treatment have done at 300℃ 1 hr, the micro-hardness has been decreased because δ' phase decomposed all.
진해만 남서부에 출현하는 자치어 군집의 종조성과 계절변동
허성회 ( Sung Hoi Huh ),한명일 ( Myung Il Han ),황선재 ( Seon Jae Hwang ),박주면 ( Joo Myun Park ),백근욱 ( Gun Wook Baeck ) 한국어류학회 2011 韓國魚類學會誌 Vol.23 No.1
진해만 남서부에 출현하는 자치어 종조성의 계절변동을 연구하기 위하여 2009년 1월에서 12월까지 매월 RN80 네트을 이용하여 시료를 채집하였다. 조사 기간 동안 24과 46종의 자치어가 채집되었다. 우점종은 청어(Clupea pallasii), 쥐노래미(Hexagrammos otakii), 전어(Konosirus punctatus), 멸치(Engraulis japonicus), 청베도라치(Parablennius yatabei), 앞동갈베도라치 (Omobranchus elegans) 순으로 많이 채집되었는데 이들 6종은 전체 채집개체수의 92.7%를 차지하였다. 어종수, 채집 개체수, 종다양도지수는 뚜렷한 계절 변동을 나타내었다. 종수와 개체수는 각각 7월과 1월에 가장 높은 값을 나타내었다. 주성분분석(PCA)와 상관분석은 군집구조와 우점종들의 출현량이 수온과 유의한 관계가 있음을 보여주었다. 특히, 청어, 쥐노래미, 멸치, 청베도라치의 출현량은 수온과 유의한 관련성이 있었다. Seasonal variation in species composition and abundance of fish larvae assemblages in the south-western Jinhae Bay were investigated monthly in 2009. During the study period, 49 larvae species belonging to 24 families were collected. The dominant species were Clupea pallasii, Hexagrammos otakii, Konosirus punctatus, Engraulis japonicus, Parablennius yatabei, and Omobranchus elegansei. These six species accounted for 92.7% of the total number of individuals collected. The number of species, number of individuals, and species diversity indices fluctuated with the seasons. The peak number of species and individuals occurred in July and January, respectively. Principal component analysis (PCA) and correlation analysis showed that variation in monthly water temperature could act as an indicator of seasonal variation in community structure and abundance of the dominant species; in particular, those of C. pallasii, H. otakii, E. japonicus and P. yatabei corresponded with the water temperature.
급냉응고된 Al-Li-Cu 합금의 열처리, 미세조직 및 기계적 성질에 관한 연구 (2)
김석윤,나형용,남승의,허명일 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.8
In this study the microstructures of rapidly solidified Al-4Li-2Cu, Al-4Li-2Cu-0.3Zr alloy powders and the mechanical properties of extrudates have been investigated. The alloy powders have been prepared by means of gas atomization technique. Rapidly solidified alloy powders show the icosahedral intermetallic compounds of five-fold symmetry which are randomly distributed in cell-boundaries of α matrix. Both of these alloy powders, heat-treated at 200℃ for 1 hour have fine δ' phases homogeneousy precipitated throughout the matrix. The precipitation of δ' phase within the α matrix increases the microhardness. After the heat-treatment at 300℃ for 1 hour, all the δ' phases has been transformed to icosahedral intermetallic compounds. Room temperature tensile strength of Al-L₁-Cu and Al-Li-Cu-Zr extrudates are 325MPa, 350MPa, respectively. Under the isothermal aging condition at 180℃, Al₃Li & A1₃Zr are precipitated in the matrix. The tensile strength of Al-Li-Cu extrudate is 425 MPa and that of Al-Li-u-Zr extrudate is 430MPa after 24 hours isothermal aging at 180℃
급냉응고된 Al-Li-Cu 합금의 열처리, 미세조직 및 기계적 성질에 관한 연구 (1)
김석윤,나형용,남승의,이범규,허명일 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.12
Effect of aging condition on the microstructure and hardness properties of Al-3Li, Al-3L₁-2Cu, Al-3Li-2Cu-0.3Zr have bean studied. The alloy ribbons have been prepared by means of Single Roll Melt Spinning by rapid solidification technique. In rapidly solidified Al-3Li-2Cu, Al-3Li-2Cu-0.3Zr alloy ribbons show the icosahedral intermetallic compound of five-fold symmetry which is placed in cell-boundary and matrix. In the matrix precipitated fine δ(Al₃Li) phase. Heat-treated at 250 ℃ 1hr. In this condition, δ'(Al₃Li) phase started decompose. The icosahedral intermetallic compound has been grown. When heat-treated at 300 ℃ 1hr, the δ(Al₃Li) phase has been decomposed all. In the matrix, icosahedral intermetallic compound has been grown greatly. The micro-hardness has been obtained in more high Al-Li-Cu-(Zr) alloy than Al-Li alloy. Strength-hardened phenomena showed solution hardening by the addition of Cu. When the heat-treated at 250 ℃ 1hr, in the alloy of Zr addition, delayed decomposed δ' phase. In the case, micro-hardness gradually decreased. When the heat-treatment have done at 300 ℃ 1hr, the micro-hardness has been decreased because δ' phase decomposed all.