首页|基于摩擦-温度双修正的Al2O3/Cu烧结坯热变形行为

基于摩擦-温度双修正的Al2O3/Cu烧结坯热变形行为

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为精准描述热变形行为,对Al2O3弥散铜烧结坯流变应力进行修正.对Al2O3弥散铜烧结坯进行热模拟试验,获得变形温度为923～1 223 K、应变速率为0.01～10 s-1条件下的流变应力曲线,根据摩擦、温度修正原理进行流变应力修正,建立基于双曲正弦本构关系Arrhenius流动应力模型的本构方程并进行误差分析.结果表明,随着变形温度降低和应变速率升高,摩擦和温升效应对流变应力的影响逐渐显著.通过数据拟合建立了各影响因素关于摩擦和温升效应修正的定量描述.基于修正后的流变应力数据建立本构方程,平均误差从修正前的9.11%降至5.20%,相关系数由0.957 35提高至0.997 56,修正后的本构方程更为精准.
Hot Deformation Behavior of Al2O3/Cu Sintered Billet Based on Friction-temperature Double Correction
The flow stress of Al2O3 dispersed copper sintered billet was modified to accurately describe the thermal deformation behavior.The thermal modeling test was conducted to obtain flow stress curve under the condition of deformation temperature of 923 K～1 223 K and strain rate of 0.01 s-1～10 s-1.The flow stress was modified by fric-tion and temperature correction principle,and the constitutive equations of Arrhenius flow stress model based on the hyperbolic sine constitutive relation were established and the error analysis was carried out.The results indicate that the effects of friction and temperature rise on the flow stress are gradually significant with the decrease of deformation tem-perature and the increase of strain rate.The quantitative descriptions of each influencing factor on correction of friction and temperature rise effects were constructed through data fitting.Based on modified flow stress data,the constitutive equation was established,where the average error is decreased from 9.11%to 5.20%,and the correlation coefficient is increased from 0.957 35 to 0.997 56,verifying the accuracy of constitutive equation.

Flow Stress CurveFriction CorrectionTemperature CorrectionAl2O3 Dispersed Copper

肖振朋、李韶林、贾淑果、国秀花、王旭、刘嵩、宋克兴

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河南科技大学材料科学与工程学院,洛阳 471000

有色金属共性技术河南省协同创新中心,洛阳 471000

河南省有色金属材料科学与加工技术重点实验室,洛阳 471000

河南省科学院,郑州 450000

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流变应力曲线 摩擦修正 温度修正 Al2O3弥散强化铜

中国博士后科学基金中国博士后科学基金河南省科技攻关计划河南省科技攻关计划河南省博士后科研项目河南省高等学校重点科研项目

2020T1301722020M68228822210223006421210221011020200206321A430014

2024

10.15980/j.tzzz.2024.05.014

特种铸造及有色合金
中国机械工程学会铸造分会

特种铸造及有色合金

CSTPCD北大核心
影响因子：0.481
ISSN：1001-2249
年,卷(期)：2024.44(5)
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