微量Co对7056铝合金组织与腐蚀性能的影响

doi:10.11896/cldb.201902021

材料导报

2019, Vol. 33

Issue (2): 314-320 https://doi.org/10.11896/cldb.201902021

金属与金属基复合材料

微量Co对7056铝合金组织与腐蚀性能的影响

周亮^1,2, 陈送义^1,2, 彭振凌³, 张星临³, 范淑敏³, 昌江郁^1,2, 袁丁玲^1,2, 陈康华1,2,3

1 中南大学轻合金研究院,长沙 410083
2 中南大学有色金属先进结构材料与制造协同创新中心,长沙 410083
3 中南大学轻质高强结构材料重点实验室,长沙410083

Effect of Trace Co on Microstructures and Corrosion Properties of 7056
Aluminum Alloy

ZHOU Liang^1,2, CHEN Songyi^1,2, PENG Zhenling³, ZHANG Xinglin³, FAN Shumin³, CHANG Jiangyu^1,2, YUAN Dingling^1,2, CHEN Kanghua^1,2,3

1 Light Alloy Research Institute, Central South University, Changsha 410083
2 Collaborative Innovation Center of Advance Nonferrous Structural Materials and Manufacturing, Central South University, Changsha 410083
3 Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083

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摘要通过金相观察、晶间腐蚀、电化学腐蚀、扫描电镜和透射电镜等测试分析方法,研究了微量Co对7056铝合金组织与腐蚀性能的影响。研究表明,与未添加Co合金相比,添加微量Co的7056铝合金的应力腐蚀寿命提高了22.57%,应力腐蚀断裂强度从511 MPa增加到559 MPa,应力腐蚀因子从0.118降到了0.064。添加微量Co的7056铝合金形成了更加均匀细小的Al₃Zr弥散相, 更有效地钉扎位错和亚界晶,使基体保持形变回复组织和小角度晶界,抑制再结晶,保持了细小的亚晶组织。亚晶界析出相与晶内接近,从而降低了晶间腐蚀的电化学动力,提升了抗晶间腐蚀性能。此外,其晶界析出相所占面积分数增大,相当于增加了电化学反应过程阳极相对阴极的比例,导致阳极电流减小,晶界析出相溶解速率降低。不连续的晶界析出相能够阻断沿晶界阳极溶解通道,减缓沿晶腐蚀,提高合金抗应力腐蚀性能。

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	周亮
	陈送义
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	张星临
	范淑敏
	昌江郁
	袁丁玲
	陈康华1
	2
	3

关键词: Co元素腐蚀性能再结晶晶界析出相

Abstract: The effect of trace Co element on the microstructures and corrosion properties of 7056 aluminum alloy was studied by metallographic observation, intergranular corrosion test, electrochemical corrosion test, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicated that the 7056 aluminum alloy with trace Co presented a 22.57% increase of stress corrosion life, an improved fracture strength of stress corrosion from 511 MPa to 559 MPa and a dropped stress corrosion factor from 0.118 to 0.064, compared with the alloy without Co. The 7056 aluminum alloy with Co formed more uniform and fine Al₃Zr dispersion phase, which effectively pinned the dislocation and subboundary, made the base keep deformation response structure and small angle grain boundary, thus restrained the recrystallization.and kept fine subcrystalline structure. The precipitation phase in the subgrain boundary is close to that in the intracrystalline, which reduced the electrochemical motivation of intergranular corrosion and improved the resistance to intergranular corrosion. Besides, the area fraction of the precipitated phase at the grain boundary increased, corresponding to the increase of the ratio of anode to cathode in electrochemical reaction process, which resulted in a decrease of the anode current and a decrease of the dissolution rate of the precipitated phase at the grain boundary. The disconti-nuous grain boundary precipitates can block anodic dissolution channels along grain boundaries, slow down the intergranular corrosion and improve the stress corrosion resistance of the alloy.

Key words: Co element corrosion property recrystallization grain boundary precipitates

发布日期: 2019-01-31

ZTFLH:

TG146.2+1

基金资助: 国家重点研发计划(2016YFB0300801);湖南省自然科学基金(2018JJ3645);国家重大科研仪器设备研制专项(51327902);中南大学研究生自由探索创新项目(2018zzts152)

作者简介: 周亮,2015年12月毕业于广东海洋大学,获工程硕士学位。现就读于中南大学轻合金研究院材料科学与工程专业。陈康华,中南大学教授,博士生导师,主要从事铝合金材料等研究。khchen@csu.edu.cn

引用本文:

周亮, 陈送义, 彭振凌, 张星临, 范淑敏, 昌江郁, 袁丁玲, 陈康华1,2,3. 微量Co对7056铝合金组织与腐蚀性能的影响[J]. 材料导报, 2019, 33(2): 314-320.
ZHOU Liang, CHEN Songyi, PENG Zhenling, ZHANG Xinglin, FAN Shumin, CHANG Jiangyu, YUAN Dingling, CHEN Kanghua. Effect of Trace Co on Microstructures and Corrosion Properties of 7056
Aluminum Alloy. Materials Reports, 2019, 33(2): 314-320.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.201902021 或 http://www.mater-rep.com/CN/Y2019/V33/I2/314

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