首页|AA7136合金的淬火敏感性与非均匀析出行为

AA7136合金的淬火敏感性与非均匀析出行为

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通过时间−温度−性能(TTP)曲线研究AA7136合金的淬火敏感性,使用扫描电镜、扫描透射电镜和高分辨电镜研究等温保温过程中的非均匀析出行为.结果显示,99.5％TTP曲线的鼻尖温度约为346℃,鼻尖处的转变时间约为0.245 s.在不同等温保温样品中观察到η(MgZn2)相、T(Al2Zn3Mg3)相、S(Al2CuMg)相或富Cu−Zn的Y相,并将这些相的析出行为描述在TTP曲线中.随着保温时间的延长,这些平衡相的尺寸和面积分数增大,导致样品时效后的硬度降低.根据晶界/亚晶界和晶内弥散粒子上非均匀析出第二相的数量分析它们对硬度下降的定量贡献.
would like to thank Dr. Ding-ling YUAN from
The quenching sensitivity of AA7136 alloy was investigated by time−temperature−property (TTP) diagrams, and the heterogeneous precipitation behavior during isothermal holding was investigated using scanning electron microscopy, scanning transmission electron microscopy and high resolution transmission electron microscopy. Based on 99.5％ TTP diagram, the nose temperature is determined to be about 346 ℃ with the transformation time of about 0.245 s. The precipitation of η (MgZn2), T (Al2Zn3Mg3), S (Al2CuMg) or Cu−Zn-rich Y phases can be found depending on isothermal holding temperature and time, and it is described in a time−temperature−precipitation diagram. The size and area fraction of isothermal holding induced phase particles increase, which results in the decrease of hardness of samples after aging. The quantitative contribution to loss of hardness by grain boundaries/subgrain boundaries and dispersoids in the matrix is discussed based on the amount of heterogeneous precipitation related to them.

AA7136 alloyquenching sensitivitytime−temperature−property diagramsheterogeneous precipitation

马志民、张勇、刘胜胆、邓运来、张新明

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中南大学 材料科学与工程学院,长沙 410083

包头职业技术学院,包头 014030

中南大学 有色金属材料科学与工程教育部重点实验室,长沙 410083

AA7136合金 淬火敏感性 时间−温度−性能曲线 非均匀析出

authors are grateful for the financial supports from the National Key Research and Development Program of Chinaand the Scientific Research Project of Inner Mongolia Colleges and Universities,China

2016YFB0300901NJZY21092.The authors would like to thank Dr.Ding-ling YUAN from Light Alloy Research Institute

2021

10.1016/S1003-6326(21)65734-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(11)
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