摘要
采用扫描电镜、硬度测试、拉伸试验及冲击性能测试,研究了3种不同热处理后Al-12Zn-2. 4Mg-1. 1Cu-0. 3Zr-0. 15Ni-0. 12Mn(质量分数,%)合金显微组织演变与力学性能的变化。结果表明:经T6处理合金的组织主要为α-Al基体、η’和η析出相,合金的平均硬度和抗拉强度分别达到210 HV和597 MPa,高于T4和T5工艺下的合金硬度和强度。η’和η相对于基体有一定的可动性,使合金的塑性降低,T6态合金的伸长率略低于T4态。T4和T5态合金的冲击断裂机制为脆性断裂,T6处理后合金的冲击性能得到明显改善,断裂机制为韧脆混合断裂。挤压态Al-Zn-Mg-Cu合金宜采用T6热处理工艺。
The microstructure evolution and mechanical properties of Al-12Zn-2. 4 Mg-1. 1Cu-0. 3 Zr-0. 15Ni-0. 12Mn( mass fraction,%)alloy under three different heat treatments were investigated by means of scanning microscope,hardness test,tensile test,and impact test.The results show that the microstructure of T6-treated alloy consists of α-Al matrix, η’ and η precipitation phases. The average microhardness and tensile strength of T6-treated alloy reach 210HV and 597 MPa respectively,which are superior to that of T4-treated and T5-treatd alloy. The elongation of T6-treated alloy is slightly lower than that of T4-treated alloy because η’ and η precipitation phases have a certain mobility relative to the matrix which reduces the plasticity of the alloy. The impact fracture mechanism of T4-treated and T5-treatd alloy is brittle fracture. The impact property of T6-treated alloy is obviously improved and the fracture mechanism is ductile-brittle mixed fracture. T6 heat treatment should be adopted to the extruded Al-Zn-Mg-Cu alloy.
作者
魏迪
杨莉
张尧成
卢王张
庞松
智雅婷
Wei Di;Yang Li;Zhang Yaocheng;Lu Wangzhang;Pang Song;Zhi Yating(School of Materials Science and Engineering,Changzhou University,Changzhou Jiangsu 213164,China;Jiangsu Key Laboratory of Recycling and Reuse Technology for Mechanical and Electronic Products,Changshu Jiangsu 215500,China;School of Automatic Engineering,Changshu Institute of Technology,Changshu Jiangsu 215500,China;Ningbo Branch of China Academy of Ordnance Science,Ningbo Zhejiang 315103,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第5期152-156,共5页
Heat Treatment of Metals
基金
国家自然科学基金(51601171,51865006,51601172)
江苏省高等学校自然科学研究项目(19KJA430001,18KJA460001)。
