A Phase-field Model to Simulate Recrystallization in an AZ31 Mg Alloy in Comparison of Experimental

来源 :Journal of Materials Science & Technology | 被引量 : 0次 | 上传用户:jc622
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A model has been established to simulate the realistic spatio-temporal microstructure evolution in recrystal- lization of a magnesium alloy using the phase field approach.A set of rules have been proposed to decide the real physical value of all parameters in the model.The thermodynamic software THERMOCALC is applied to determine the local chemical free energy and strain energy,which is added to the free energy density of grains before recrystallization.The Arrhenius formula is used to describe boundary mobility and the activity energy is suggested with a value of zinc segregation energy at the boundary.However,the mobility constant in the formula was found out by fitting to a group of grain size measurements during recrystallization of the alloy. The boundary range is suggested to decide the gradient parameters in addition of fitting to the experimental boundary energy value.These parameter values can be regarded as a database for other similar simulations and the fitting rules can also be applied to build up databases for any other alloy systems.The simulated results show a good agreement with reported experimental measurement of the alloy at the temperatures from 300 to 400℃for up to 100 rain but not at 250℃.This implies a mechanism variation in activity energy of the boundary mobility in the alloy at low temperature. A model has been established to simulate the realistic spatio-temporal microstructure evolution in recrystal- lization of a magnesium alloy using the phase field approach. A set of rules have been proposed to decide the real physical value of all parameters in the model. Thermodynamic software THERMOCALC is applied to determine the local chemical free energy and strain energy, which is added to the free energy density of grains before recrystallization. Arrhenius formula is used to describe boundary mobility and the activity energy is suggested with a value of zinc segregation energy at the boundary. Even, the mobility constant in the formula was found out by fitting to a group of grain size measurements during recrystallization of the alloy. The boundary range is suggested to decide the gradient parameters in addition of fitting to the experimental boundary energy value These parameter values ​​can be viewed as a database for other similar simulations and the fitting rules can al so be applied to build up databases for any other alloy systems. The simulated results show a good agreement with reported experimental measurement of the alloy at the temperatures from 300 to 400 ° C for up to 100 rain but not at 250 ° C. This implies a mechanism variation in activity energy of the boundary mobility in the alloy at low temperature.
其他文献
在小学高段语文教学中,引导小学生进行拓展阅读十分重要,这样才能促进他们的语言积累,丰富他们的语感能力.基于此背景对紧扣课文内容,引导拓展阅读;基于课文语言,引导拓展阅
一、前言作为与当代素质教育完全吻合的一种学习理论,合作学习是被新一轮课程改革所积极提倡的学习方式。从某种角度而言,合作学习是对传统教学模式的补充,越来越多的教师开
“素质教育是指依据人的发展和社会发展的实际需要,以全面提高全体学生的基本素质为根本目的,以尊重学生主体性和主动精神,注重开发人的智慧潜能,注重形成人的健全个性为根本
期刊
自信可以提升人的气质,自信可以提升人说话做事的底气,增加成功率。爱因斯坦16岁时第一次报考大学,选学物理未被录取,主考官劝他改学别的,他拒绝道:“在这方面我觉得自己有才
“中国知网”——知识服务专家“中国知网”创始于1995年,由清华大学、清华同方共同发起,是以实现全社会知识资源传播共享与增值利用为目标的信息化建设项目。目前已建成了世
期刊
语文学科是工具性与人文性的统一,在小学语文阅读教学中,渗透德育教育十分重要,这样才能有效地促进小学生核心素养的提升.基于此背景,对在阅读教学中渗透品格教育,在阅读教学
“中国梦”是中华民族近代以来最伟大的梦想。中国梦也是我们每个人的梦。你的中国梦,是什么样的呢?来自新疆乌鲁木齐市87小四(1)班的朱柏萱小朋友说她的中国梦就是拥有一个
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
期刊
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
期刊
Using Fourier transform infrared spectroscopy(FTIR),we measured water contents in quartz and feldspar for four kinds of felsic rocks,i.e.,undeformed granite,ban