首页|等径角挤压对AZ80M合金在半固态等温加热过程中液相分布的影响

等径角挤压对AZ80M合金在半固态等温加热过程中液相分布的影响

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将经过等径角挤压(ECAP)和未经ECAP的AZ80-0.2Y-0.15Ca(质量分数,％)(AZ80M)合金试样进行半固态等温加热处理,得到两种半固态坯料.对两种坯料的在半固态等温加热处理前后的显微组织进行比较和分析.研究结果表明,在半固态等温加热处理中,经过3道次ECAP(3P)后的试样与初始挤压态试样的液相分布明显不同.半固态处理后的3P试样具有更均匀的液相分布,这是因为其半固态系统中具有更小的二面角.另外,初始挤压态试样和3P试样的固相晶粒粗化过程分别由合并机制和奥斯瓦尔德熟化机制主导.这两种材料在半固态过程中显示出的不同粗化机制主要与大角晶界的占比有关,随着半固态过程的进行,不同的粗化机制会进一步影响液池的演变行为.
Effect of ECAP process on liquid distribution of AZ80M alloy during semi-solid isothermal heat treatment
Two kinds of semi-solid samples of AZ80-0.2Y-0.15Ca (wt.％) (AZ80M) magnesium alloy were prepared by semi-solid isothermal heat treatment of materials with and without equal channel angular pressing (ECAP) process. The microstructures of initial and semi-solid treated samples were compared and analyzed. The results showed a significant difference in the liquid phase distribution between three-pass ECAP processed (3P) and as-received samples during the isothermal heating process. The semi-solid 3P sample showed a more uniform liquid distribution due to its smaller dihedral angle. Besides, the coarsening processes of solid grains of as-received and 3P samples were dominated by the coalescence and Ostwald ripening mechanism, respectively. The difference of coarsening processes was mainly related to the proportion of the high-angle grain boundaries in materials, which further affected the evolution behavior of the liquid pools.

AZ80Mequal channel angular pressingsemi-solid microstructureliquid phase distributioncoarsening mechanism

范玲玲、周明扬、郭阳阳、张钰雯茜、权高峰

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西南交通大学 材料科学与工程学院 材料先进技术教育部重点实验室,成都 610031

中国核动力研究设计院 核反应堆系统设计技术重点实验室,成都 610213

AZ80M 等径角挤压 半固态显微组织 液相分布 粗化机制

This work was supported by Key Development Project of Sichuan ProvinceAcknowledgements are given to the equipment support from Litmat Technology Chengdu Co.,Ltd.,China

Grant 2017GZ0399

2021

10.1016/S1003-6326(21)65601-7

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(6)
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