CAJ | 학술논문

通过显微硬度测试、拉伸实验、扫描电镜和透射电镜观察，研究微量Sn对Al-2.5Cu-1.5Mg(质量分数，%)合金的力学性能及微观组织演变的影响。结果表明：在Al-2.5Cu-1.5Mg合金中添加少量Sn能提高合金第二阶段的时效硬化和强化效果，微量Sn能够显著地提高合金的塑性，含Sn合金的峰时效伸长率能达到20.5%；经150℃时效1000 h后，合金的伸长率仍有10.5%；微量Sn的添加能促进Al-2.5Cu-1.5Mg合金中S相析出，并能抑制其粗化。
통과현미경도측시、랍신실험、소묘전경화투사전경관찰，연구미량Sn대Al-2.5Cu-1.5Mg(질량분수，%)합금적역학성능급미관조직연변적영향。결과표명：재Al-2.5Cu-1.5Mg합금중첨가소량Sn능제고합금제이계단적시효경화화강화효과，미량Sn능구현저지제고합금적소성，함Sn합금적봉시효신장솔능체도20.5%；경150℃시효1000 h후，합금적신장솔잉유10.5%；미량Sn적첨가능촉진Al-2.5Cu-1.5Mg합금중S상석출，병능억제기조화。
The effects of trace Sn additions on the ageing behavior and microstructure evolution of Al-2.5Cu-1.5Mg alloy were investigated by the microhardness test, tensile test, SEM and TEM. The results indicate that the trace Sn addition can increase the hardening and strengthening of the second stage of ageing. Adding trace Sn can significantly improve the ductility of Al-2.5Cu-1.5Mg alloy, the elongation of Sn-containing alloy at peak aged is 20.5%, and the alloy elongation is still 10.5%after aged at 150 ℃ for 1 000 h. The trace Sn addition can promote S phase precipitate and inhibit the S phase coarsen at over-aged.