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%, ...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 ℃ 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.展开更多
LZ91 magnesium alloy extruded sheets were subjected to cold rolling.The microstructure and texture evolution were tracked using optical microscopy(OM)and X-ray diffraction(XRD).Theα-Mg andβ-Li phases were elongated ...LZ91 magnesium alloy extruded sheets were subjected to cold rolling.The microstructure and texture evolution were tracked using optical microscopy(OM)and X-ray diffraction(XRD).Theα-Mg andβ-Li phases were elongated along rolling direction(RD),contributing to the formation of a thin lamellar“sandwich”structure.This“sandwich”structure is favored for glissile dislocation ofα-Mg phase during rolling.Theα-Mg andβ-Li phases are near Burgers orientation relationship,resulting in an unusual RD texture component in(0002)pole figure.展开更多
基金Projects(2016YFB07004032016YFB0301100)supported by the National Key Research and Development Program of China+3 种基金Project(cstc2019jcyj-msxmX0306)supported by the Chongqing Research Program of Basic Research and Frontier Technology,ChinaProjects(2018CDGFCL00052018CDJDCL0019)supported by the Fundamental Research Funds for the Central Universities,ChinaProject(B16007)supported by the 111 Program of Ministry of Education and the State Administration of Foreign Experts Affairs of China。
文摘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 ℃ 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.
基金support from the National Natural Science Foundation of China(Grant No.51601062,51605159 and 51475162).
文摘LZ91 magnesium alloy extruded sheets were subjected to cold rolling.The microstructure and texture evolution were tracked using optical microscopy(OM)and X-ray diffraction(XRD).Theα-Mg andβ-Li phases were elongated along rolling direction(RD),contributing to the formation of a thin lamellar“sandwich”structure.This“sandwich”structure is favored for glissile dislocation ofα-Mg phase during rolling.Theα-Mg andβ-Li phases are near Burgers orientation relationship,resulting in an unusual RD texture component in(0002)pole figure.
