摘要
通过末端淬火、差示扫描量热仪(DSC)、扫描电镜(SEM)、透射电镜(TEM)、X线衍射仪(XRD)、光学显微镜(OM)和硬度等分析测试方法研究Al-8.0Zn-2.0Mg-1.6Cu铝合金的淬透性及淬火冷却过程中的微观组织演变。研究结果表明:随着冷却速度的降低,试样的硬度显著下降,其淬透深度约为40 mm,临界冷却速度约为3.8℃/s;淬火冷却过程中平衡态MgZn2(η)相析出是影响该合金淬透性的主要因素,其析出温度区间为438～215℃;平衡态MgZn2相在淬火冷却时先后经历晶界与晶粒内部2个过程的析出,析出峰值温度分别为387℃和342℃。
The hardenability and structures on Al-8.0Zn-2.0Mg-1.6Cu aluminum alloy were determined by end-quench test,differential scanning calorimetry（DSC）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,X-ray diffraction（XRD）,optical microscopy（OM） and hardness.The result shows that with the decrease of cooling rate the hardness decreases significantly,and the quenched depth is about 40 mm with critical cooling velocity 3.8 ℃/s.The precipitation of MgZn2（η） phases precipitating in 438-215 ℃ interval is the primary factor that affects the hardenability of this alloy during the quenching.The equilibrium state MgZn2 phases precipitate as two paths successively during the quenching： grain boundaries and inside the grains,with the peak temperature 387 ℃ and 342 ℃ respectively.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第11期3289-3295,共7页
Journal of Central South University:Science and Technology
基金
国家重点基础研究发展计划(“973”计划)项目(2010CB731700)
