Effect of Temper and Test Temperature on Fatigue Crack Growth Properties of IM, PM and Particulate Reinforced 6061 Al Metal Matrix Composites
Date Issued
2003
Date
2003
Author(s)
Huang, Jui-Cherng
DOI
zh-TW
Abstract
The tensile, fatigue crack growth properties and overload retardation phenomenon of 6061 Al alloy fabricated by ingot metallurgy (IM), powder metallurgy (PM) routes and SiC particulate reinforced 6061 composites have been evaluated in both T4 and T6 tempers at temperatures ranging from 25 to 300 0C. In order to characterize the fracture behavior of the materials, the microstructure was observed by transmission electron microscope (TEM) and fracture surfaces of the specimens were examined with a scanning electron microscope (SEM).
At 25 0C, the PM alloy and composites possess a higher strength, higher strain hardening rate and a lower elongation than the IM alloy and PM alloy, respectively. Raising the testing temperature from 25 to 200 0C greatly reduced the advantage in strength of the PM alloy and composites over that of the IM alloy and PM alloy, respectively. At 300 0C, both alloys and composites possess similar strength.
The fatigue crack growth resistance in the TL orientation is inferior to that in the LT orientation for both alloys and composites in T4 and T6 tempers. The difference in crack growth resistance between the two orientations decreases with increasing temperature and is basically non-existent at 300 0C. Furthermore, the fatigue crack growth resistance in the T6 temper is superior to that in the T4 temper. In both alloys, fatigue crack growth resistance decreases with increasing temperature. At all temperatures, the PM alloy always has an inferior crack growth resistance as compared to the IM alloy. At low
Subjects
溫度
疲勞裂縫生長
時效
顆粒破裂
介面脫開
Particulate
Overload
Fatigue crack growth
Interfacial
Temperature
Temper
Type
thesis
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