서지주요정보
$Al_3M(M=Ti,V,Zr)$ 분산강화 Al 합금 및 $Al_{3-x}Mn_x(Ti,Zr)$ 금속간화합물의 상평형 및 미세구조에 관한 연구 = A study on phase equilibria and microstructures of $Al_3M(M=Ti,V,Zr)$- dispersed Al alloys and $Al_{3-x}Mn_x(Ti,Zr)$ intermetallic compounds
서명 / 저자 $Al_3M(M=Ti,V,Zr)$ 분산강화 Al 합금 및 $Al_{3-x}Mn_x(Ti,Zr)$ 금속간화합물의 상평형 및 미세구조에 관한 연구 = A study on phase equilibria and microstructures of $Al_3M(M=Ti,V,Zr)$- dispersed Al alloys and $Al_{3-x}Mn_x(Ti,Zr)$ intermetallic compounds / 한승전.
발행사항 [대전 : 한국과학기술원, 1997].
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소장정보

등록번호

8007403

소장위치/청구기호

학술문화관(문화관) 보존서고

DMS 97011

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

리뷰정보

초록정보

$Al_3M$(M=Ti,V,Zr) intermetallic compound was modified by substituting transition elements in order to design a dispersion phase having high coarsening resistance in Al alloys for high temperature application. Three intermetallic compound dispersed Alloys made with a high volume percent of $Al_3$(Ti,V,Zr) are prepared by vacuum arc melting. Two intermetallic phases are found in alloys. One is V rich $D0_22-Al_3$(Ti,V,Zr) and the other is Zr rich $D0_23-Al_3$(Ti,V,Zr). Their compositional and morphological studies were made along with the lattice mismatches between the matrix and intermetallics, and the lattice misfit between two different $Al_3M$ phases is found to decrease conspicuously with increase in Ti content, and this phenomenon were maintained in which only intermetallic compound were existed. To be used as the basis for alloy design, this study has been continued on constructing the ternary section of $Al_3Ti-Al_3V-Al_3Zr$ system in quaternary Al-Ti-V-Zr phase diagram. The addition of Mn to the tetragonal $Al_3(Ti_{1-x}Zr_x)$ phase produces the cubic $L1_2$-type $Al_66Mn_9(Ti,Zr)_25$ with small amount of second phases such as $Al_8Mn_5$ and $Al_2Zr$ still existing in the as-cast state. Second phases disappear when intermetallic compounds are homogenized at 1000℃ for 24 hour, and alloys are monolithic with compositional segregations still existent. So, the combined addition of Ti and Zr makes the alloy more brittle compared to the addition of Ti or Zr alone. The tetragonal $D0_23$ intermetallic compound were produced from the pseudo ternary $Al_3Ti-Al_3V-Al_3Zr$ diagram, and the Mn added cubic $L1_2$-type $Al_66Mn_9(Ti_{1-x}Zr_x)_25$ were produced. This intermetallic compound were produced in the form of powder and mixed with pure Al by attritor mill and then vacuum hot pressed. IDS (intermetallic-dispersion strengthened) Al Alloys prepared in this way were analyzed in terms of phase stabilities and microstructures. The intermetallic dispersant in IDS alloy were less than 1 ㎛ after vacuum hot pressed and were not coarsened at 425℃ for 400 hours. And the microhardness of each alloys was not changed. The compression test were performed at room temperature and 420℃ that was 0.75 melting point of Al. The yield stress of $D0_23$ and $L1_2$ intermetallic dispersed alloy at room temperature were showed 920 and 800 Mpa, and at 420℃ were showed 260 and 187 Mpa respectively.

서지기타정보

서지기타정보
청구기호 {DMS 97011
형태사항 xii, 136 p. : 삽화 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Seung-Zeon Han
지도교수의 한글표기 : 이혁모
지도교수의 영문표기 : Hyuck-Mo Lee
수록잡지명 : "Effect of alloyed Ti:Zr ratio on phase stability of Al66Mn9(Ti,Zr)25 intermetallic compounds". J.of Intermetallics. ELSEVIER, vol.4, pp. 245-249 (1996)
학위논문 학위논문(박사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 133-136
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