Effects of under-aging treatment on microstructure and mechanical properties of squeeze-cast Al-Zn-Mg-Cu alloy

被引：17

作者：

Wang, Fei-fan ^{[1
,2
]}

Meng, Wen ^{[1
,2
]}

Zhang, Hong-wei ^{[1
]}

Han, Zhi-qiang ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Minist Educ, Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 10期

关键词：

Al-Zn-Mg-Cu alloy; squeeze casting; under-aging treatment; GP zone; precipitation strengthening; COOLING PROCESS; EVOLUTION; STRENGTH; MODEL;

D O I：

10.1016/S1003-6326(18)64837-X

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effects of under-aging treatment on the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy produced by squeeze casting were investigated using optical microscopy (OM), X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and hardness and tensile testing. The results showed that most of secondary phases were dissolved into a(Al) matrix while no significant grain growth happened under the condition of solution treatment at 470 degrees C for 4 h. Due to the strengthening effect of GP zones, for alloys treated by under-aging process, the increase of aging time and aging temperature improved the ultimate tensile strength (UTS) and yield strength (YS), but decreased the elongation (delta) to some extent. By utilizing appropriate aging time and temperature, the best combination of strength and ductility could be obtained to fulfill the design requirements of automobile components.

引用

页码：1920 / 1927

页数：8

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