Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 36, Issue 18, Pages 2010-2017Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2020.1853361
Keywords
LZ91 alloy; cold-rolled; annealing; microstructure; mechanical properties
Funding
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2019jcyj-msxm0438]
- Ministry of Education and the State Administration of Foreign Experts Affairs of China [B16007]
- fundamental Research funds for Central Universities [2020CDJDPT001]
- National Key Research and Development Program of China [2016YFB0700403, 2016YFB0301100]
- National Natural Science Foundation [51601024]
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Effects of annealing temperature on the microstructure and mechanical properties of cold-rolled LZ91 alloy are investigated. The results indicate that LZ91 alloy is composed of alpha-Mg, beta-Li, MgLiZn and MgLi2Zn phases. The recrystallization of the cold-rolled alloy is completed when annealing at 125 degrees C and a large number of fine equiaxed grains with an average grain size of 3 mu m is formed. The cold-rolled LZ91 alloys annealed at 125 degrees C have the optimized comprehensive mechanical properties with the elongation, ultimate tensile strength and microhardness of 56.1%, 157 MPa and 51.2 HV, respectively. With the further increase in annealing temperature, the grain size begins to coarsen, which leads to the decrease in strength and ductility of the alloy.
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