CAJ | 학술논문

研究了铸造铝合金 AlSi9 Cu3在不同应变幅值下的单轴低周疲劳行为。利用 MT S 疲劳实验机测试了材料的宏观疲劳性能，揭示了应变幅与疲劳寿命之间的关系，使用金相和扫描电子显微镜观察样品的疲劳断口，并对其进行分析。研究结果表明，铸造铝合金AlSi9 Cu3在应变控制下表现为循环硬化，且应变幅值越大硬化速率越高；应变幅值越大，其寿命越短；合金塑性应变、弹性应变与断裂时的载荷反向次数之间呈直线关系，实验结果符合 Coffin-Manson 公式。对材料的疲劳断口在SEM下观察，发现疲劳条纹的宽度和应变幅值相关，疲劳损伤程度也与应变幅值相关。
연구료주조려합금 AlSi9 Cu3재불동응변폭치하적단축저주피로행위。이용 MT S 피로실험궤측시료재료적굉관피로성능，게시료응변폭여피로수명지간적관계，사용금상화소묘전자현미경관찰양품적피로단구，병대기진행분석。연구결과표명，주조려합금AlSi9 Cu3재응변공제하표현위순배경화，차응변폭치월대경화속솔월고；응변폭치월대，기수명월단；합금소성응변、탄성응변여단렬시적재하반향차수지간정직선관계，실험결과부합 Coffin-Manson 공식。대재료적피로단구재SEM하관찰，발현피로조문적관도화응변폭치상관，피로손상정도야여응변폭치상관。
Low-cycle fatigue behavior of cast AlSi9 Cu3 aluminum alloy under different strain amplitudes were studied.Fatigue behavior were tested by MTS,the relationship between strain amplitude and fatigue life were revealed.Fatigue fracture were analyzed by optical and scanning electron microscope.The research results show that under low-cycle fatigue loading condition,the cast AlSi9 Cu3 aluminum alloy can exhibit the continuous cy-clic strain hardening or initial cyclic strain hardening followed by cyclic stability,and the bigger of strain ampli-tude,the higher of hardening rate;A single-slope linear relation between plastic strain amplitude,elastic strain amplitude and reversals to failure was observed from cast alloy,the experimental results conform to the Coffin-Manson formula.Fatigue fracture of material observed by SEM,the width of the fatigue stripes was related to strain amplitude,fatigue damage was related to the strain amplitude also.