Sc元素对ZL205A合金组织和力学性能的影响

doi:10.11868/j.issn.1001-4381.2018.000086

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摘要

利用金相显微镜、扫描电镜、透射电镜等手段，研究Sc含量对砂型铸造ZL205A合金的组织和力学性能的影响规律。结果表明，Sc含量低于0.12%（质量分数，下同），未发现晶粒细化效果；Sc含量为0.06%，热处理态的合金晶界出现残留颗粒状W（AlCuSc）相，随Sc含量增加，W相由颗粒状转变为连续条带状；ZL205A合金热处理后弥散析出少量Al₃（Zr_x，Ti_1-x）相，添加Sc后弥散相转变为Al₃（Zr_x，Ti_y，Sc_1-x-y）相，弥散相的数量随Sc含量的增加而增加；由于弥散相数量的增加，Sc含量为0.06%时，合金的时效响应速率和硬度峰值均略有增加，合金的屈服强度提高了4%；Sc含量为0.12%时，晶界残留相增加，Cu在α（Al）中的浓度降低，θ'相密度明显降低，合金的时效响应速率、硬度峰值以及力学性能各项指标均大幅下降；ZL205A合金中添加0.06%的Sc，即可明显地抑制θ'相的长大。

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	刘闪光
	李国爱
	罗传彪
	李海超
	陆政
	戴圣龙

关键词 ： ZL205A, Sc合金化, 时效行为, 弥散强化, 沉淀强化

Abstract：

The microstructure and ageing precipitation behavior of ZL205A alloy with different addition of Sc were investigated by OM, SEM and TEM. The results show that the grain refinement effect of Sc (up to 0.12%, mass fraction, the same below) is not observed in ZL205A alloy; the residual particle W (AlCuSc) phase is formed after heat treatment when the Sc content is 0.06%, and transformed to strip-liked structure with the increase of Sc content in the grain interface; the dispersed phases Al₃ (Zr_x, Ti_1-x) in ZL205A alloy are transformed to Al₃ (Zr_x, Ti_y, Sc_1-x-y), and the number of the dispersed phases increase with the increase of Sc content; when the Sc content is 0.06%, the ageing response, peak hardness increase slightly, and the yield strength increases by 4%; while the Sc content increases to 0.12%, the decrease of the solute concentration may reduce the number of the θ' phase due to the strip-liked W phase formed in the grain interface, which results in the dramatic decrease of the ageing response, peak hardness and mechanical properties; traces of Sc help to slow down the growth of θ' phase during the over-aged stage.

Key words： ZL205A Sc alloying ageing behavior dispersion strengthening precipitation strengthening

收稿日期: 2018-01-22 出版日期: 2020-01-09

中图分类号:

TG292

基金资助:国家自然科学基金资助项目(51474195)

通讯作者: 陆政 E-mail: luzheng621@126.com

作者简介: 陆政(1966—), 男, 研究员, 硕士, 主要从事铝合金研究, 联系地址:北京市81信箱2分箱(100095), E-mail:luzheng621@126.com

引用本文:

刘闪光, 李国爱, 罗传彪, 李海超, 陆政, 戴圣龙. Sc元素对ZL205A合金组织和力学性能的影响[J]. 材料工程, 2020, 48(1): 84-91.
Shan-guang LIU, Guo-ai LI, Chuan-biao LUO, Hai-chao LI, Zheng LU, Sheng-long DAI. Effect of Sc on microstructure and mechanical properties of ZL205A alloy. Journal of Materials Engineering, 2020, 48(1): 84-91.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000086 或 http://jme.biam.ac.cn/CN/Y2020/V48/I1/84

Table 1 不同Sc含量的ZL205A合金的化学成分(质量分数/%)

Fig.1 ZL205A合金的冷却曲线

Fig.2 不同Sc含量的ZL205A合金的铸态组织
(a)ZL205A的铸态组织；(b)ZL205A合金的共晶组织；(c)ZL205A+0.06%Sc；(d)ZL205A+0.12%Sc

Table 2 图 1中P1点及P2点的成分分析

Fig.3 不同Sc含量的ZL205A合金的热处理后的组织
(a)ZL205A；(b)ZL205A+0.06%Sc；(c)ZL205A+0.12%Sc

Fig.4 不同Sc含量的ZL205A合金经热处后的SEM照片及元素分布
(a)ZL205A；(b)ZL205A+0.06%Sc；(c)ZL205A+0.12%Sc；(d)图(c)中晶界残留相的局部放大及Cu，Sc元素分布

Table 3 图 3中所示P1点和P2点的成分分析

Fig.5 时效温度为175 ℃时不同Sc含量对ZL205A合金时效硬化过程的影响

Fig.6 Sc含量对ZL205A合金时效析出过程的影响
(a)ZL205A时效3 h；(b)ZL205A+0.06%Sc时效3 h；(c)ZL205A+0.12%Sc时效3 h；(d)ZL205A时效5 h；(e)ZL205A+0.06%Sc时效5 h；(f)ZL205A+0.12%Sc时效8 h；(g)ZL205A时效35 h；(h)ZL205A+0.06%Sc时效35 h；(i)ZL205A+0.12%Sc时效35 h

Fig.7 不同Sc含量的ZL205A合金中的弥散相
(a)ZL205A;(b)ZL205A+0.06%Sc; (c)ZL205A+0.12%Sc

Table 4 不同Sc含量ZL205A合金中Cu在α(Al)中的浓度(质量分数/%)

Table 5 不同Sc含量ZL205A合金的力学性能

Fig.8 不同Sc含量的ZL205A合金拉伸断口表面SEM图
(a)ZL205A；(b)ZL205A+0.06%Sc；(c)ZL205A+0.12%Sc

Table 6 图 8中P1点的成分分析

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