中南大学学报（自然科学版）2017，Vol.48Issue(12)：3193-3199,7.DOI:10.11817/j.issn.1672-7207.2017.12.008
铸态AZ31B镁合金高温变形行为数学建模
Mathematical modeling about as-cast AZ31B magnesium alloy deformation under high temperature
摘要
Abstract
The as-cast AZ31B magnesium alloy cylindrical samples were compressed uniaxially by employing the Gleeble-1500 thermo-mechanical simulator. Using the dynamic material model, thermal processing diagram under the condition ofε=0.4 was calculated to study the thermal deformation behavior of AZ31B and further establish the structure-activity relationship between the true stress, strain, temperature and strain rate. The results show that the activation energy for hot deformation has a high nonuniform distribution over temperature. The average estimation for activation energy within the whole scope leads to larger fitting error of the Arrhennius constitutive equation. Decomposition of deformation temperature of 523-723 K into 523-573 K, 573-623 K and 623-723 K to establish the Arrhennius constitutive equation respectively can effectively improve the prediction accuracy of peak stress. The new hot compression deformation resistance model, which is established on the basis of the improved Sellars and Arrhennius models using simple and common mathematical equations, can accurately characterize the thermal deformation behaviors of AZ31B in the range of 523-723 K and 0.005-5.000 s-1.关键词
热加工图/峰值应力/变形抗力Key words
thermal processing diagram/peak stress/deformation resistance分类
矿业与冶金引用本文复制引用
马立峰,贾伟涛,黄志权,林金宝..铸态AZ31B镁合金高温变形行为数学建模[J].中南大学学报（自然科学版）,2017,48(12):3193-3199,7.基金项目
国家自然科学基金资助项目(51105264) （51105264）
山西省高校青年学术带头人计划项目(TYAL) （TYAL）
山西省科技攻关项目 (20130321010-03)(Project (51105264) supported by the National Natural Science Foundation of China （20130321010-03）
Project (TYAL) supported by the Plan for Youth Academic Leaders in Universities of Shanxi Province （TYAL）
Project (20130321010-03) supported by Key Project of Science and Technology Department of Shanxi Province) （20130321010-03）
