서지주요정보
Boron 첨가와 aluminum stoichiometry 가 $Ni_3Al$의 기계적 성질 및 응고조직에 미치는 영향 = The effect of boron addition and aluminum stoichiometry on mechanical properties and solidification sturcture in $Ni_3Al$
서명 / 저자 Boron 첨가와 aluminum stoichiometry 가 $Ni_3Al$의 기계적 성질 및 응고조직에 미치는 영향 = The effect of boron addition and aluminum stoichiometry on mechanical properties and solidification sturcture in $Ni_3Al$ / 강준모.
저자명 강준모 ; Kang, Joon-Mo
발행사항 [서울 : 한국과학기술원, 1986].
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소장정보

등록번호

4103636

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8602

SMS전송

도서상태

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초록정보

The effect of boron addition and aluminum stoichiometry on mechanical properties and solidification structure in $Ni_3Al$ were studied. Specimens with varying boron and aluminum concentrations were prepared by arc melting and rapid solidification of melt spinning. Room temperature ductility and fracture behavior depended greatly on deviation from aluminum stoichiometry. When tensile tested as melt spun state, boron improved both ductility and yield strength dramatically in hypostoichiometry (24% Al) and stoichiometry (25% Al) $Ni_3Al$. But in hyperstoichiometry (26% Al) $Ni_3Al$, boron did increase yield strength, but it did not improve the ductility of the alloy. However, annealing at 800℃ or 1000℃ for 2 hours after melt spinning for the B-doped hyperstoichiometry $Ni_3Al$ resulted in about 10% tensile elongation. And fracture mode also changed from pure intergranular fracture mode to mixed mode of intergranular and transgranular fracture occurring simultaneously. It was found that yield strength of $Ni_3Al$ increased with increased boron concentration regardless of both aluminum stoichiometry and annealing temperature. However, the degree of strengthening was more pronounced in hyperstoichiometry $Ni_3Al$. It is proposed that the difference in the degree of strengthening was due to phase stability or APB energy differences rather than simple solid solution hardening. The solidification structure of $Ni_3Al$ also changed markedly with varying aluminum and boron concentrations. In hypostoichiometry $Ni_3Al$, grain contained dendrites of similar shape. But in hyperstoichiometry $Ni_3Al$, grain contained irregularly shaped dendrites considered as β phase which did not transform to γ' phase. In hypostoichiometry $Ni_3Al$, grain boundary second phase precipitated as boron concentration exceeded 0.75%. But in stoichiometry and hyperstoichiometry $Ni_3Al$, second phase cannot be observed up to 1% boron concentration.

서지기타정보

서지기타정보
청구기호 {MMS 8602
형태사항 iv, 44 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Joon-Mo Kang
지도교수의 한글표기 : 임호빈
공동교수의 한글표기 : 김영길
지도교수의 영문표기 : Ho-Bin Im
공동교수의 영문표기 : Young-Gil Kim
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 43-44
주제 Metals Dx Mechanical properties.
Metals --Rapid solidfication processing.
Microstructure.
첨가물 효과. --과학기술용어시소러스
응고 조직. --과학기술용어시소러스
니켈 합금. --과학기술용어시소러스
기계적 성질. --과학기술용어시소러스
Aluminum-nickel alloys.
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