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| EFFECT OF RETROGRESSION AND REAGING TREATMENT ON MICROSTRUCTURE AND PROPERTIES OF Al ALLOY LC9 |
| HONG Bande MENG Xianglin (Harbin Institute of Technology) |
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Cite this article:
HONG Bande MENG Xianglin (Harbin Institute of Technology). EFFECT OF RETROGRESSION AND REAGING TREATMENT ON MICROSTRUCTURE AND PROPERTIES OF Al ALLOY LC9. Acta Metall Sin, 1987, 23(1): 13-150.
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Abstract The effect of a new heat treatment process,namely,retrogression and reag- ing(RRA),on the mierostructure and properties of A1 alloy LC9 of A1-Zn-Mg-Cu system has been studied.After the alloy of T6 underwent further treatment of 220℃,5 rain retrogression and 120℃,24h reaging,the room temperature tensile properties of the alloy kept no more inferior to that of T6,but such a stress corrosion resistance may be superior to T73 state.The corresponding change in microstrueture of the alloy shows the formation of precipitated phase of two different sizes,both coarse and fine,in the grains,thus,the strength is much improved.Meanwhile,the tip of precipitates along grain boundary becomes obtuse,the alloying elements are depleted in the region near the grain boundary and the stress corrosion resistance is bettered.
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Received: 18 January 1987
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