In Situ Fibers
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Definition:
Fibers that can be produced by directional solidification of cast alloys and are actually part of the alloy being precipitated from the melt as the alloy solidifies. This type of transformation usually involves eutectic alloys in which the molten material decomposes into two or more phases at constant temperature. When the solidifying phases are unidirectional the product is known as a directionally solidified eutectic. Ceramic matrix composites can also be fabricated to contain in situ fibers similar to the all-metal systems. Many eutectic combinations of chromium, tantalum, niobium, tungsten, and molybdenum, in conjunction with ceramics such as the oxides of cerium, chromium, uranium and zirconium, have been identified. In addition, there are various all-ceramic systems leading to similar structures. In situ fiber composites have improved fracture toughness, high temperature resistance and better damage tolerance. In situ fibers are also known as LAMINAE.
Definition Copyright ©1989 CRC Press LLC. All rights
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