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The present study aims at investigating the effects of eutectic Si particles on mechanical properties
and fracture toughness of three A356 aluminum alloys. These A356 alloys were fabricated by casting processes
such as rheo-casting, squeeze-casting, and casting-forging, and their mechanical properties and fracture
toughness were analyzed in relation with microfracture mechanism study. All the cast A356 alloys contained
eutectic Si particles mainly segregated along solidification cells, and the distribution of Si particles was
modified by squeeze-casting and casting-forging processes. Microfracture observation results showed that
eutectic Si particles segregated along cells were cracked first, but that aluminum matrix played a role in
blocking crack propagation. Tensile properties and fracture toughness of the squeeze cast and cast-forged
alloys having homogeneous distribution of eutectic Si particles were superior to those of the rheo-cast alloy.
In particular, the cast-forged alloy had excellent hardness, strength, ductility, and fracture toughness because
of the matrix strengthening and homogeneous distribution of eutectic Si particles due to forging process.
The present study aims at investigating the effects of eutectic Si particles on mechanical properties
and fracture toughness of three A356 aluminum alloys. These A356 alloys were fabricated by casting processes
such as rheo-casting, squeeze-casting, and casting-forging, and their mechanical properties and fracture
toughness were analyzed in relation with microfracture mechanism study. All the cast A356 alloys contained
eutectic Si particles mainly segregated along solidification cells, and the distribution of Si particles was
modified by squeeze-casting and casting-forging processes. Microfracture observation results showed that
eutectic Si particles segregated along cells were cracked first, but that aluminum matrix played a role in
blocking crack propagation. Tensile properties and fracture toughness of the squeeze cast and cast-forged
alloys having homogeneous distribution of eutectic Si particles were superior to those of the rheo-cast alloy.
In particular, the cast-forged alloy had excellent hardness, strength, ductility, and fracture toughness because
of the matrix strengthening and homogeneous distribution of eutectic Si particles due to forging process.| 기사명 | 저자명 | 페이지 | 원문 | 목차 |
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| 11Cr 페라이트강의 열화특성에 미치는 제어압연의 영향 | 송상민 ;홍석우 ;배득승 ;정우상 ;정순효 ;권숙인 | pp.1-5 |
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| 페라이트계 스테인리스강의 열간압연 시 발생하는 sticking 현상 연구 | 손창영 ;김창규 ;하대진 ;이성학 ;이종석 ;김광태 ;이용득 | pp.6-17 |
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| 주조 A356 알루미늄 합금의 기계적 성질과 파괴인성에 미치는 공정 Si 입자의 영향 | 이규홍 ;권용남 ;이성학 | pp.18-29 |
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| OLED 디스플레이를 위한 2,5-다이아이오도티오페인의 초기박막 형성에 관한 연구 | 류근걸 ;이윤배 ;김성한 | pp.51-54 |
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| ReSi_1.75_ 단결정의 열전특성에 미치는 Ge 첨가효과 | 오민욱 ;H. Inui ;오명훈 ;김봉서 ;박수동 ;이희웅 ;위당문 | pp.55-60 |
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| 밀폐유도용해로 제조된 CoSb_3-y_Sn_y_의 열전특성 | 박관호 ;정해일 ;어순철 ;김일호 | pp.61-64 |
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