<strong>SiC/2009Al</strong>复合材料的变形加工参数的优化仿真研究

doi:10.11900/0412.1961.2019.00020

金属学报

2019, Vol. 55

Issue (10): 1329-1337 DOI: 10.11900/0412.1961.2019.00020

本期目录 | 过刊浏览

SiC/2009Al复合材料的变形加工参数的优化仿真研究

马凯^1,²,张星星¹,王东¹,王全兆¹,刘振宇¹,肖伯律¹(

),马宗义¹

1. 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
2. 中国科学技术大学材料科学与工程学院沈阳 110016

Optimization and Simulation of Deformation Parameters of SiC/2009Al Composites

MA Kai^1,²,ZHANG Xingxing¹,WANG Dong¹,WANG Quanzhao¹,LIU Zhenyu¹,XIAO Bolv¹(

),MA Zongyi¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

马凯, 张星星, 王东, 王全兆, 刘振宇, 肖伯律, 马宗义. SiC/2009Al复合材料的变形加工参数的优化仿真研究[J]. 金属学报, 2019, 55(10): 1329-1337.
Kai MA, Xingxing ZHANG, Dong WANG, Quanzhao WANG, Zhenyu LIU, Bolv XIAO, Zongyi MA. Optimization and Simulation of Deformation Parameters of SiC/2009Al Composites[J]. Acta Metall Sin, 2019, 55(10): 1329-1337.

全文: PDF(14159 KB) HTML

摘要:

对粉末冶金法制备的15%SiC (体积分数)/2009Al复合材料热变形参数的仿真优化方法进行了探讨。通过热压缩实验获得复合材料的动态真应力-真应变曲线，由此建立了最大应变量下应变速率敏感指数(m)分布图。在不同m值对应的变形参数下，对复合材料的热压缩过程进行有限元模拟，分析了热压缩样品的流变应力、应变、危险系数分布等，结合微观组织验证了以m作为评价复合材料加工参数依据的可靠性，并由此确定15%SiC/2009Al复合材料的最佳热变形参数所对应的变形温度和应变速率分别为500 ℃和0.01 s^-1。

关键词 ：铝基复合材料, 热变形, 本构方程, 有限元模拟

Abstract：

Particle reinforced aluminum matrix composites (PRAMCs) have the advantages of high specific strength and high specific modulus, and are important engineering materials for aerospace field. However, due to the huge difference in the mechanical properties between the reinforcements and the aluminum matrixes, the plastic forming of PRAMCs is quite difficult, which restricts their wide engineering applications. In order to improve the quality of plastic processing, it is necessary to optimize deformation parameters of PRAMCs. In this study, the hot deformation parameters of a 15%SiC/2009Al composite fabricated by powder metallurgy were optimized using a simulation method. Firstly, true stress-strain curves of the SiC/2009Al composite were obtained through hot compression tests, and then the strain rate sensitivity index (m) map at the ultimate strain was established. Under the deformation parameters corresponding to various m values, the finite element simulation of the hot compression process was carried out. The flow stress, strain and damage coefficient distribution of the hot-compressed samples were analyzed. The results show that it is reliable to use the m value as the basis for optimizing the processing parameters, which were further verified by the microstructural observations. The deformation temperature and strain rate corresponding to the optimum parameters of the composite were determined to be 500 ℃ and 0.01 s^-1, respectively.

Key words： aluminum matrix composite hot deformation constitutive equation finite element simulation

收稿日期: 2019-01-24

ZTFLH:

TG319

基金资助:国家重点研发计划(2017YFB0703104);国家自然科学基金面上项目(51871214);国家自然科学基金委员会-辽宁省政府联合基金重点项目(U1508216)

作者简介: 马凯，男，1994年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00020 或 https://www.ams.org.cn/CN/Y2019/V55/I10/1329

图1 有限元模拟几何模型

图2 15%SiC/2009Al复合材料的真应力-真应变曲线

图3 15%SiC/2009Al复合材料的应变速率敏感系数(m)随变形参数的分布

图4 15%SiC/2009Al复合材料的门槛应力(σth)随温度变化

图5 15%SiC/2009Al复合材料在不同变形参数下的等效应力场、最大主应力场和等效应变场分布图

图6 15%SiC/2009Al复合材料不同变形参数下的等效应变量随试样位置变化

图7 15%SiC/2009Al复合材料压缩变形时的危险系数(D)

图8 15%SiC/2009Al复合材料压缩变形试样中的SiC分布

图9 15%SiC/2009Al复合材料变形参数为500 ℃、0.01 s-1、真应变(ε)为1.0时的危险系数模拟结果

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