Effects of aging on the tensile and fatigue behavior of the near-α Ti-1100 at room temperature and 593 °C

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Long term aging of Ti-1100 alloy at its intended service temperature of 593 °C results in the formation of two types of precipitates, Ti3Al and (TiZr)6Si3. The effect of aging times corresponding to the conditions of unaged, peak aged (10 000 min), and overaged (>60 000 min) on tensile behavior is studied at two test temperatures: room temperature and 593 °C. Aging produces an increase in yield strength and a decrease in ductility at both test temperatures. The decrease in ductility is much more pronounced at room temperature than at 593 °C. Aging also suppresses the appearance of serrations associated with dynamic strain aging in the plastic portion of the tensile curve at 593 °C. However, another feature of dynamic strain aging, namely a lack of strain rate effect on yield, is not substantially changed by the aging process. The effect of aging on fatigue crack growth rates (FCGR) at room temperature and 593 °C is also examined. Aging increases FCGR at room temperature but produces a slight decrease in FCGR at 593 °C. © 1994.

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Materials Science and Engineering A