CAJ | 학술논문

利用金相显微镜、扫描电镜（ SEM）、X射线衍射（ XRD）、透射电镜（ TEM）、维氏硬度计、断裂韧性性能测试等实验手段，研究了添加0．1％Sn对AA7085铝合金组织与性能的影响。结果表明：添加含量为0．1％的Sn能够细化AA7085合金的铸态组织，形成了Mg2 Sn的第二相，且该相在后续的热处理过程中能够保留下来；添加Sn能够加快AA7085铝合金120℃下的时效初期的时效响应速度，延缓峰值时效出现的时间，同时使合金在过时效阶段保持较高的硬度和较低的硬度降低速率；另外，添加Sn的AA7085的抗拉强度和屈服强度分别为511 MPa和468 MPa，比未添加Sn的合金的抗拉强度和屈服强度（504 MPa和441 MPa）均有所提高，断裂韧性也从33．8 MPa·m1／2提高到35．5 MPa·m1／2，表现出良好的综合力学性能。
이용금상현미경、소묘전경（ SEM）、X사선연사（ XRD）、투사전경（ TEM）、유씨경도계、단렬인성성능측시등실험수단，연구료첨가0．1％Sn대AA7085려합금조직여성능적영향。결과표명：첨가함량위0．1％적Sn능구세화AA7085합금적주태조직，형성료Mg2 Sn적제이상，차해상재후속적열처리과정중능구보류하래；첨가Sn능구가쾌AA7085려합금120℃하적시효초기적시효향응속도，연완봉치시효출현적시간，동시사합금재과시효계단보지교고적경도화교저적경도강저속솔；령외，첨가Sn적AA7085적항랍강도화굴복강도분별위511 MPa화468 MPa，비미첨가Sn적합금적항랍강도화굴복강도（504 MPa화441 MPa）균유소제고，단렬인성야종33．8 MPa·m1／2제고도35．5 MPa·m1／2，표현출량호적종합역학성능。
Influences of 0. 1% Sn addition on the microstructure and mechanical properties of AA7085 alloys were investigated through fracture toughness testing and Vickers hardness testing combined with metallurgical microscope, scanning electron microscope ( SEM) , X?ray diffraction and transmission electron microscope ( TEM) . The results show that the addition of 0.1% Sn can made the as?cast structure of AA7085 alloy finer, forming Mg2 Sn second phase which will remain during the subsequent heat?treatment. Adding Sn can speed up the ageing response speed of AA7085 alloy at 120 ℃ in early aging, as well as delay the time to reach peak ageing, meanwhile, resulting in the alloy with a higher hardness and lower decreasing rate in hardness during the overaging stage. Furthermore, the tensile strength and yield strength of the AA7085?Sn alloy are 511 MPa and 468 MPa, respectively, higher than those of the alloy without Sn addition(504 MPa and 441 MPa). The fracture toughness of the AA7085?Sn alloy also increases from 33.8 MPa·m1/2 to 35.5 MPa·m1/2, exhibiting good comprehensive mechanical properties.