서지주요정보
70Cu-30Ni 합금에서 유효응력과 전위구조로 해석한 creep 기구에 관한 연구 = An interpretation of the creep mechanism of 70Cu-30Ni alloy in terms of effective stress and dislocation structure
서명 / 저자 70Cu-30Ni 합금에서 유효응력과 전위구조로 해석한 creep 기구에 관한 연구 = An interpretation of the creep mechanism of 70Cu-30Ni alloy in terms of effective stress and dislocation structure / 홍준화.
저자명 홍준화 ; Hong, Jun-Hwa
발행사항 [서울 : 한국과학기술원, 1980].
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소장정보

등록번호

4000912

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8031

SMS전송

도서상태

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초록정보

The steady-state creep mechanism of a 70Cu-30Ni alloy was studied in the temperature range of 400-700 ℃ (0.44-0.64Tm) and in the constant stress range of 1.5-34.3Kg/㎟ (14.7-336.4Mpa). Using the results obtained from strain transient dip test, stress change creep test, TEM investigation and high temperature tensile test, corelation of those parameters-$σ^*$, $σ_i$, $σ_a$ dislocation structure and density were made and discussed for the interpretation of the creep behavior. Form the above experimental data, steady-state creep rate can be expressed by as follow: ◁수식 삽입▷(원문을 참조하세요) where $\acute{A}$ is the temperature and structure independent term whose value is $1.84×10^{-4}$, $n^*=2.6$ and $α_{0.05}$ is proof stress at engineering strain e=0.05. From the above equation, it is thought that the same value of $\frac{σ^*}{σ_{0.05}}$ at various temperatures means the same external effect on the steady-state creep rate. In conclusion, the creep deformation mechanism of the alloy is best explained by the non-conservative motion of jogged screw dislocation model, because of the facts that the stress exponent, n, is observed to be a function of applied stress and test temperature, that the apparent creep activation energy decreases as the applied stress increases and that the experimentally obtained activation length, $1^*$, has the order of $10^2 - 10^3$$\dot{A}$.

서지기타정보

서지기타정보
청구기호 {MMS 8031
형태사항 [iv], 94, 9 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Jun-Hwa Hong
지도교수의 한글표기 : 남수우
지도교수의 영문표기 : Soo-Woo Nam
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 86-94
주제 Copper alloys.
Strains and stresses.
Dislocations.
구리 합금. --과학기술용어시소러스
유효 응력. --과학기술용어시소러스
전위 (수정) --과학기술용어시소러스
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