Enhanced and accelerated age hardening response of Al-5.2Mg-0.45Cu (wt%) alloy with Zn addition
Enhanced and accelerated age hardening response of Al-5.2Mg-0.45Cu (wt%) alloy with Zn addition
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增强%20和%20加速%20时效%20硬化%20响应%20of%20Al-5.2Mg-0.45Cu%20(wt%)%20合金%20with%20Zn%20添加
DOI：
10.1016/j.msea.2016.04.022
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发表时间：
2016-06-01
期刊：
影响因子：
6.4
通讯作者：
Zhang, Jishan
中科院分区：
文献类型：
--
作者：
Cao, Cheng;Zhang, Di;Zhang, Jishan
研究了添加锌的Al-5.2 Mg-0.45Cu合金的时效硬化行为。结果表明，含锌Al-5.2 Mg-0A5Cu合金的时效硬化过程可分为四个阶段，即初始跳跃阶段(I)、线性增长阶段(II)、加速上升到峰值阶段(III)和过时效阶段(IV)。在Al-5.2 Mg-0A5Cu合金中加入锌后，合金的时效硬化响应从两个方面得到了增强和加速：一是由于高的镁锌比和较高的时效温度而引入了T-[Mg-32(Al，Zn)(49)]相，二是通过提高淬火时的过饱和度来促进Guinier-Preston-Bagaryatsky(GPB)区的析出，以及由于T相的形成而增加了基体中的铜/镁比，从而加速了S-Al2MgCu相的析出。峰值硬度是S相和T相共同作用的结果。用原子探针层析(APT)和高分辨电子显微镜(HRTEM)详细研究了时效1h后溶质的聚集和分配行为。结果表明，在含铜合金的前两个时效硬化阶段，镁铜团簇(S相的先驱相)先于镁锌团簇(T相的先驱相)的形成，是导致时效硬化的主要原因。(C)2016爱思唯尔B.V.保留所有权利。
The age hardening responses of the Al-5.2Mg-0.45Cu alloy with Zn addition have been investigated in this study. It is found that the age hardening process of the Zn-containing A1-5.2Mg-0A5Cu alloys can be divided into four stages, namely the initial jump(I), the linear increase (II), the accelerated increase to the peak (III) and the overage (IV). The addition of Zn to the A1-5.2Mg-0A5Cu alloy leads to an enhanced and accelerated age-hardening response in two aspects: firstly introducing the T-[Mg-32(Al, Zn)(49)] phase resulting from the high Mg/Zn ratio and relatively high aging temperature; secondly stimulating the precipitation of the Guinier-Preston-Bagaryatsky (GPB) zones by increasing the supersaturation upon quenching, and accelerating the precipitation of S-Al2MgCu phase by increasing Cu/Mg ratio in the matrix due to the formation of the T phase. The peak hardness is from the synergetic effects of the S and T phases. The clustering and partitioning behaviors of solutes after 1 h aging treatment have been investigated in detail using atom probe tomography (APT) and high resolution transmission electron microscopy (HRTEM). It is shown that the formation of Mg-Cu clusters (precursor of the S phase) precedes that of Mg-Zn clusters (precursor of T phase), and the Mg-Cu clusters are responsible for the age hardening during the first two age hardening stages in the Cu-bearing alloys. (C) 2016 Elsevier B.V. All rights reserved.