CAJ | 학술논문

2219铝合金在蠕变时效过程中，随时效时间的增加，抗拉强度及屈服强度在开始6h内增加较快，这主要是由于位错强化和时效强化的共同作用，超过6h后，由于位错密度趋于恒定，位错强化作用减弱，时效析出的粒子也逐渐形成稳定相，抗拉强度及屈服强度值增加缓慢，但绝对值仍保持增加。在此过程中，延伸率逐渐下降。
2219려합금재연변시효과정중，수시효시간적증가，항랍강도급굴복강도재개시6h내증가교쾌，저주요시유우위착강화화시효강화적공동작용，초과6h후，유우위착밀도추우항정，위착강화작용감약，시효석출적입자야축점형성은정상，항랍강도급굴복강도치증가완만，단절대치잉보지증가。재차과정중，연신솔축점하강。
In the process of creep ageing, the ultimate tensile strength and the yield stress of aluminium alloy 2219 increase quickly in the first 6h. This effect is due to the cooperation of dislocation and age. After 6h, the effect of the dislocation become weak because of the stable density, and the precipitate become to form stable phase, the value of the ultimate tensile strength and the yield stress increase slowly, but the absolute value keep on increasing. Meanwhile, the value of the elongation decrease gradually.