Effects of Aging Treatment on Nano-Sized Precipitates and Properties of Spray Formed Al–Zn–Mg–Cu Alloy
Effects of Aging Treatment on Nano-Sized Precipitates and Properties of Spray Formed Al–Zn–Mg–Cu Alloy
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时效处理对喷射成形Al-Zn-Mg-Cu合金纳米析出相及性能的影响
DOI：
10.1166/nnl.2018.2576
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发表时间：
2018
影响因子：
--
通讯作者：
Changyun Li
中科院分区：
文献类型：
--
作者：
Guo Gong;Jianbing Jiang;Wei Li;Changyun Li
通过拉伸试验和平面应变断裂韧性（KIC）测试，研究了时效处理对喷射成形Al-Zn-Mg-Cu合金中纳米析出相及性能的影响。利用光学显微镜（OM）、扫描电镜（SEM）和透射电镜（TEM）对合金的微观组织进行了分析。结果表明，T6试样的强度最好，但断裂韧性最差。断裂机制主要为沿晶断裂。过时效处理（T76）后，合金的强度下降，断裂韧性提高，断裂方式为沿晶断裂。随着时效时间的延长（T74），合金的断裂韧性最好，而强度最低。它表现出穿晶和沿晶断裂的混合。T74中的无沉淀区（PFZ）尺寸约为61.1 nm，这对获得高断裂韧性发挥了重要作用。
The effects of aging treatment on nano-sized precipitates and properties of spray formed Al–Zn–Mg–Cu alloy were investigated by tensile test and plane strain fracture toughness (K IC ) test. The microstructures of alloys were investigated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results revealed that T6 samples showed the best strength but the worst fracture toughness. The main fracture mechanism was the intergranular fracture. After over-aged treatment (T76), the strength was decreased and the fracture toughness was increased, and the alloy exhibited intergranular fracture. With the increase of the aging time (T74), the alloy exhibited the best fracture toughness, while the lowest strength. It exhibited a mix of transgranular and intergranular fracture. The size of precipitated-free zones (PFZs) in T74 was about 61.1 nm, which played an important role to obtain high fracture toughness.