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Add Ce, Zn, Sc on the microstructure and mechanical properties of 2195 Al-Li alloy

Author: YinDengFeng
Tutor: ZhengZiZuo
School: Central South University
Course: Materials Science
Keywords: 2195 alloy Ce, Zn, Sc, T8, T6 Microstructure Mechanical behavior
CLC: TG113
Type: Master's thesis
Year: 2002
Downloads: 120
Quote: 0
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Abstract


This thesis add trace (or smaller) cerium , zinc , scandium microstructure of 2195 Al-Li alloy under different heat treatment system (T 8 , T 6 ) and mechanical properties , tensile strength , elongation of the test as well as transmission electron microscopy (TEM), scanning electron microscopy , the results show that : 1 . adding trace Ce 2195 alloy can significantly improve the performance of trace Ce alloy strength and ductility while increasing the main reason is that : on the one hand trace Ce strengthening phase T 1 phase, θ ' phase increases and more uniform fine dispersion of 2195 alloy can , on the other hand , trace Ce alloy organization hierarchical more \Add a small amount of Zn in 2195 alloy and enables alloy aging significantly faster and significantly enhanced aging effect alloy mechanical properties can close T- 8 T 6 conditions < states / sub> 2195 alloy , a small amount of Zn in addition to promoting T 1 phase θ 'phase finer dispersion, and the increase in the number of outside , but also generate spherical granules containing Zn phase jointly strengthen , thus 2195 alloy strength greatly improved, but a small amount of Zn can not change the fracture mechanism of the alloy , and the alloy plasticity also adversely affected . 3 in the 2195 alloy addition of trace Sc T 8 conditions , slow down the aging process , T 1 phase evenly distributed , with an average size Less alloy intragranular precipitation small , the of precipitation T subgrain boundaries and grain boundaries 1 phase becomes small , almost no obvious grain boundary precipitate free zone , and therefore can hardly reduce the strength of the alloy premise greatly improve its plasticity , and can partially improve the fracture mode , it fractography performance thin layered transgranular fracture mode is different from the 2195 alloy layered intergranular fracture mode . But add trace Sc Queshi 2195 alloy in high temperature aging T 6 process conditions showed a more substantial decline in the strength and ductility .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Metallographic microstructure and properties of the (metal )
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