中南大学学报（自然科学版）2016，Vol.47Issue(7)：2242-2248,7.DOI:10.11817/j.issn.1672-7207.2016.07.009
Zn与Mg质量比对Al-Zn-Mg-Cu合金淬火敏感性的影响
Effect of mass ratio of Zn to Mg on quench sensitivity of Al-Zn-Mg-Cu aluminum alloys
摘要
Abstract
The effects of m(Zn)/m(Mg) on quench sensitivity of Al-(3.0−5.0)Zn-(3.5−4.5)Mg-1.0Cu (mass fraction) were investigated by end quenching technique and hardness testing. According to the microstructure examination by the transmission electron microscopy, the mechanism of m(Zn)/m(Mg) on quench sensitivity was discussed based on the interaction between Zn, Mg atoms and vacancies. The results show that the increase of m(Zn)/m(Mg) tends to decrease quench sensitivity. The hardened depths of the end-quenched and aged specimens of the alloys with m(Zn)/m(Mg) of 0.70, 1.13 and 1.36 increase and the values are 35, 65 and 100 mm, respectively. The increase of m(Zn)/m(Mg) is favorable for homogeneous nucleation of η′ phase, and therefore leads to more and fine dispersed η′ hardening precipitates in the slowly-quenched specimens after aging. And the strengthening effect is enhanced, the drop degree of hardness due to slow quenching is decreased, and consequently quench sensitivity is lowered.关键词
Al-Zn-Mg-Cu合金/末端淬火/m(Zn)/m(Mg)/淬火敏感性Key words
Al-Zn-Mg-Cu alloy/end quenching/m(Zn)/m(Mg)/quench sensitivity分类
矿业与冶金引用本文复制引用
刘胜胆,尹邦文,李东锋,雷越,张新明..Zn与Mg质量比对Al-Zn-Mg-Cu合金淬火敏感性的影响[J].中南大学学报（自然科学版）,2016,47(7):2242-2248,7.基金项目
国家重点基础研究发展规划(973计划)项目(2012CB619501)；国家国际科技合作专项项目(2013DFG51890)；中南大学升华育英计划项目(2012)(Project(2012CB619501) supported by the National Basic Research Development Program (973 Program) of China （973计划）
Project (2013DFG51890) supported by the International Science and Technology Cooperation Program of China （2013DFG51890）
Project(2012) supported by the Yuying Project of Central South University) （2012）
