Effect of rolling reduction and annealing process on microstructure and corrosion behavior of LZ91 alloy sheet

The effect of rolling reduction and annealing process on the microstructure and corrosion behavior of Mg−9Li−1Zn (LZ91) alloy was investigated. The test alloy sheets were cold rolled with the reduction of 50% and 75%, respectively, and then were annealed at 200 °C for 1 h. The microstructure of test...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2020-07, Vol.30 (7), p.1816-1825
Main Authors: MA, Li-na, YANG, Yan, ZHOU, Gang, REN, Feng-juan, DENG, Hong-ju, WEI, Guo-bing, Peng, Xiao-dong
Format: Article
Language:English
Subjects:
annealing
cold rolling
corrosion resistance
LZ91 alloy
microstructure
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Summary:The effect of rolling reduction and annealing process on the microstructure and corrosion behavior of Mg−9Li−1Zn (LZ91) alloy was investigated. The test alloy sheets were cold rolled with the reduction of 50% and 75%, respectively, and then were annealed at 200 °C for 1 h. The microstructure of test alloys was observed by OM and SEM while the phase composition was determined by XRD. The corrosion property was evaluated by electrochemical measurements and immersion tests. The results show that LZ91 alloy sheet consists of α-Mg, β-Li and precipitated Mg−Li−Zn compounds (MgLi2Zn and MgLiZn phases). Dynamic recrystallization grains appear in β-Li phase during annealing process, leading to grain refinement. The results indicate that the increasing rolling reduction and performing the annealing process can enhance the corrosion resistance of LZ91 alloy. The 75% cold-rolled and annealed LZ91 alloy shows the best corrosion resistance.
ISSN:1003-6326
DOI:10.1016/S1003-6326(20)65341-9