Transactions of Materials and Heat Treatment

Title：Constitutive equations of aluminum alloy 6014 sheet under warm tension

Authors： Shen Zhi Xie Tan Liang Peixin

Unit： Nanchang Institute of Technology Beijing Research Institute of Mechanical and Electrical Technology

KeyWords： aluminum alloy 6014 warm tension constitutive equation flow stress ductile fracture britle fracture

ClassificationCode：TG146.21

year,vol(issue):pagenumber：2017,42(12):144-149

Abstract：

The warm tension tensile tests of aluminum alloy 6014 sheet were performed at deformation temperatures of 298-573 K with strain rate of 0.0001-0.01 s-1 on DDL50 high temperature electronic universal testing machine, and a constitutive equation modified by Fields & Backofen equation was established to describe the flow behavior of aluminum alloy 6014 in warm tensile. The results show that under the same strain rate, with the increasing of temperature the flow stress decreases, while the elongation increases firstly and then decreases, and the elongation reaches the highest value at 473 K. Then, the fracture surface was observed by SEM to analyze the difference of fracture process at 473 K and 573 K. The results show that the dimples on fracture are big and deep at 473 K, and the fracture is typical ductile fracture. While the dimples are small and shallow at 573 K, and the fracture is typical brittle fracture. Thus, the difference of elongation at different temperatures is analyzed from microscopic view.

Funds：

国家重大科技专项“高档数控机床与基础制造装备”（2014ZX04002-071）

作者简介：沈智（1980-），男，博士,工程师，讲师 E-mail：nickshen009@163.com

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