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| A CRYSTALLOGRAPHIC INVESTIGATION ON THE AGE-HARDENING PROCESS OF Mg-5wt-%Zn-Al ALLOY |
| by XU Genbao; XU Shunsheng (S. S. Hsu) (Shanghai Institute of Metallurgy; Academia Sinica) (Manuscript received 18 January; 1986; revised manuscript 22 July; 1986) |
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Cite this article:
by XU Genbao; XU Shunsheng (S. S. Hsu) (Shanghai Institute of Metallurgy; Academia Sinica) (Manuscript received 18 January; 1986; revised manuscript 22 July; 1986). A CRYSTALLOGRAPHIC INVESTIGATION ON THE AGE-HARDENING PROCESS OF Mg-5wt-%Zn-Al ALLOY. Acta Metall Sin, 1987, 23(4): 274-399.
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Abstract Plate-like solute atom clusters parallal to (0001)_(Mg) and {1010}_(Mg) planes have been observed in the as-quenched alloy. The age-hardening process of the alloy at 150℃ is: super-saturated solid solution→β_1'→redissolved→β_2'→β_2'+β; and that at 220℃ is: super-saturated solid solution→β_2'→β_2'+β. The results show that β_1' pocesses two-and three-dimensinal morphologies and β_2' is one-dimensional rod precipitates perpendicular to (0001)_(Mg) plane. β_1' particles precipitated out from the matrix at the initial stage of 150℃ aging, which exist only for a very short period. However, β_2' and β coexisted for a long time at the later stage. The structural parameters of β_1' and β_2' as well as their orientational relationships with the matrix have also been determined. The addition of Al promotes the age-hardening process and enchances the thermal stability of β_2'.
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Received: 18 April 1987
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