纳米颗粒增强镁基复合材料触变成形本构模型（英文）  

Constitutive Model of Particulate-Reinforced Nanocomposites for Thixotropic Plastic Forming

作　　者：闫洪[1,2] 邱鸿旭[1,2] 刘少平[1,2] 胡志[1,2] 

机构地区：[1]南昌大学,江西南昌330031 [2]轻合金制备及成型重点实验室,江西南昌330031

出　　处：《稀有金属材料与工程》2016年第10期2539-2542,共4页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51364035,51165032);Loading Program of Science and Technology of College of Jiangxi Province(KJLD14003)

摘　　要：通过分析纳米颗粒增强镁基复合材料半固态触变塑性成形中不同因素(应力σ、应变ε、应变速率ε、温度T、液相分数f_L、增强颗粒体积分数f_p)之间的关系,同时考虑Orowan增强机制,由此提出一种新的本构模型。该本构模型中各参数由多元非线性回归法演算而得。触变塑性成形实验数据与数值模拟数据吻合良好,证明推导的本构关系可用于触变塑性成形的数值模拟,并可用来指导复合材料的触变塑性成形工程实践。With the consideration of Orowan strengthening effect, a new constitutive model of particulate-reinforced magnesium matrix nanocomposites for thixotropic plastic forming was derived by analyzing relationships among parameters （stress , strain , strain rate , liquid phase rate fL, volume fraction of nano-reinforcement fp, temperature T）. The multiple nonlinear regression method was used to determine the parameters in the constitutive model. The findings indicate that there exists a specific constitutive relationship of thixotropic plastic forming of nanocomposites and the corresponding model was proposed. The calculated values obtained from the constitutive model had good agreement with the experimental results. As a result, the constitutive model provides references for the thixotropic forming theory, simulation and fabrication of nanocomposites.

关 键 词：纳米复合材料 触变成形 本构关系 Orowan增强机制 

分 类 号：TB333[一般工业技术—材料科学与工程]