CAJ | 학술논문

研究了2524合金(Al?4.3Cu?1.5Mg)通过蠕变机器施加不同应力(0、173和250 MPa)在170°C时效的微观组织变化，测定了不同应力下的硬度曲线，并利用透射电镜(TEM)观察相应的微观组织。结果表明：施加应力的样品，时效后其峰值硬度增加，而达到峰值硬度所需的时间缩短；时效成形后，S(Al2CuMg)相长度变短，而密度增加；弹性应力下GPB区对峰值硬度起主要作用。
연구료2524합금(Al?4.3Cu?1.5Mg)통과연변궤기시가불동응력(0、173화250 MPa)재170°C시효적미관조직변화，측정료불동응력하적경도곡선，병이용투사전경(TEM)관찰상응적미관조직。결과표명：시가응력적양품，시효후기봉치경도증가，이체도봉치경도소수적시간축단；시효성형후，S(Al2CuMg)상장도변단，이밀도증가；탄성응력하GPB구대봉치경도기주요작용。
Microstructures of creep-aged 2524 (Al?4.3Cu?1.5Mg) aged at 170 °C with various stresses (0, 173 and 250 MPa) were studied on a creep machine. Ageing hardness curves under various stresses were plotted and the corresponding microstructures were characterized by transmission electron microscopy (TEM). The results show that the value of peak hardness is increased, while the time to reach the peak hardness is reduced under an external stress. Meanwhile, the length of S(Al2CuMg) phase is shorter and the number density of S phases is larger in the creep-aged alloy. The predominant contribution to the peak hardness can be ascribed to the GPB zones with an elastic stress.