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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Spinodal Decomposition and Ordering Transformation in U6Nb Alloy
Author(s) Luke L. Hsiung
On-Site Speaker (Planned) Luke L. Hsiung
Abstract Scope Microhardness measurement, tensile test, and transmission electron microscopy (TEM) analysis were conducted to investigate low-temperature aging behavior of a water-quenched U6Nb alloy. The alloy was subjected to the following heat-treatments: 1) thermal aging of an as-quenched alloy at 200C, 2) natural aging of water-quenched alloy at ambient temperatures for 15 years (15-year-old alloy), and 3) thermal aging of 15-year-old alloy at 200C and 212C. During the early stages of thermal aging of as-quenched alloy at 200C, microhardness increased as a result of spinodal decomposition; microhardness decreased after over-aging of the alloy for 16 hours. Atomic ordering was found to occur in the 15-year-old alloy according to TEM diffraction contrast analysis. Microhardness and tensile strength of the thermally aged 15-year-old alloy continuously increased even after prolonged aging for 240 hours at 200C as a result of precipitation hardening. Transformation pathways and kinetics of ordering transformation will be proposed and discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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