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The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy
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Affiliation:

College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology

Clc Number:

TG113.12

Fund Project:

National Key Research and Development Program of China (2016YFB0300801), National Natural Science Foundation of China (51671005 and 51621003) and Beijing Natural Science Foundation (2162006).

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    Abstract:

    The effect of homogenization treatment on aging behavior of Al3(Sc,Zr) and homogeneity of Mg were studied in an Al-6Mg-0.4Mn-0.15Zr-0.04Sc alloy using Micro-hardness test, optical microscope, scanning electron microscope and transmission electron microscope. The peak hardness of alloy annealing at the normal homogeneous temperature of 475℃ was 83HV, much lower than those isochronally annealed at 175-550℃, demonstrated that the alloy did not obtained the sufficient aging strengthening from Al3(Sc,Zr) particle during one-stage annealing at 475℃. Therefore, two-stage homogeneous treatment was designed. The first stage annealing was selected from 275-350℃, where the 300℃ exhibited the highest peak hardness of 87HV, and the second-stage annealing were performed at 475℃ with the peak hardness of 92HV. The microstructure analyses indicated the Al3(Sc,Zr) particles in two-stage annealing were much finer than that of one step annealing. After annealing at 300℃/7h+475℃/15h, the segregation of Mg disappeared and the Al3(Sc,Zr) particles formed dispersedly at the same time.

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[Ding Yusheng, Gao Kunyuan, Guo shanshan, Huang Hui, Wen Shengping, Wu Xiaolan, Nie Zuoren. The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy[J]. Rare Metal Materials and Engineering,2020,49(5):1803~1809.]
DOI:10.12442/j. issn.1002-185X.20190283

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History
  • Received:April 02,2019
  • Revised:May 05,2019
  • Adopted:May 15,2019
  • Online: June 05,2020
  • Published: