锻压技术

等温处理对Mg-3Y-4Nd-1Ni-0.5Zr合金半固态坯料件显微组织的影响

英文标题：Influence of isothermal treatment on microstructure of Mg-3Y-4Nd-1Ni-0.5Zr alloy semi-solid billet

单位：1.航空工业成都飞机工业（集团）有限责任公司 2.西南交通大学材料科学与工程学院

关键词：等温加热法稀土镁合金半固态温度保温时间粗化合并机制 Ostwald熟化机制

分类号：TG146.22

出版年,卷(期):页码：2023,48(5):51-60

摘要：

采用半固态等温加热法，观察Mg-3Y-4Nd-1Ni-0.5Zr合金在不同半固态温度（580、595、610和625 ℃）和保温时间（5、15、30和60 min）下的微观组织形貌，研究工艺参数对显微组织演变的影响，得到晶粒粗化机制和最佳半固态触变成形工艺参数。结果表明：经过等温加热处理后，Mg-3Y-4Nd-1Ni-0.5Zr合金组织由细小的α-Mg晶粒转变为球形颗粒；随着半固态温度和保温时间的增加，Mg-3Y-4Nd-1Ni-0.5Zr合金的平均晶粒尺寸、液相率和形状系数逐渐增加。当半固态温度低于595 ℃或保温时间少于30 min时，半固态显微组织演变主要以晶粒长大为主，粗化合并机制起主导作用；当半固态温度高于610 ℃或保温时间超过30 min时，半固态显微组织液相增加和固相颗粒球状化，Ostwald熟化机制起主导作用。最佳工艺参数为：半固态温度为625 ℃、保温时间为15 min，此工艺参数下的Mg-3Y-4Nd-1Ni-0.5Zr合金的平均晶粒尺寸、液相率和形状系数分别为（60.9±3.1）μm，（31.2±1.4）%和（64.1±0.4）%。

The microstructure of Mg-3Y-4Nd-1Ni-0.5Zr alloy was observed by semi-solid isothermal heating method under different semi-solid temperatures (580, 595, 610 and 625 ℃) and holding times (5, 15, 30 and 60 min), and the influences of process parameters on microstructure evolution were investigated to obtain the grain coarsening mechanism and optimum semi-solid thixoforming process parameters. The results show that Mg-3Y-4Nd-1Ni-0.5Zr alloy structure changes from fine α-Mg grains to spherical particles after isothermal heating treatment, and the average grain size, liquid fraction and shape coefficient of Mg-3Y-4Nd-1Ni-0.5Zr alloy increase with the increasing of semi-solid temperature and holding time. When the semi-solid temperature is lower than 595 ℃ or the holding time is less than 30 min, the microstructure evolution of semi-solid microstructure is mainly dominated by grain growth, and coarsening merge mechanism plays a leading role. When the semi-solid temperature is higher than 610 ℃ or the holding time is more than 30 min, the liquid phase of the semi-solid microstructure increases， the solid particles become spheroidal, and the Ostwald ripening mechanism plays a dominant role. The optimal process parameters are the semi-solid temperature of 625 ℃ and the holding time of 15 min. Under the optimal process parameters, the average grain size, liquid fraction and shape coefficient of Mg-3Y-4Nd-1Ni-0.5Zr alloy are (60.9±3.1)μm, (31.2±1.4)% and (64.1±0.4)%, respectively.

基金项目：

四川省科技厅重点研发计划项目（2017GZ0399）

作者简介：张虹桃（1995-），男，硕士，助理工程师，E-mail：zht1547986876@126.com；通信作者：权高峰（1958-），男，博士，教授，E-mail：suhlhust@sina.com

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