Dynamic Abnormal Grain Growth in Molybdenum

作者：Worthington Daniel L^*; Pedrazas Nicholas A; Noell Philip J; Taleff Eric M

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2013, 44A(11): 5025-5038.

DOI：10.1007/s11661-013-1865-x

A new abnormal grain growth phenomenon that occurs only during continuous plastic straining, termed dynamic abnormal grain growth (DAGG), was observed in molybdenum (Mo) at elevated temperature. DAGG was produced in two commercial-purity molybdenum sheets and in a commercial-purity molybdenum wire. Single crystals, centimeters in length, were created in these materials through the DAGG process. DAGG was observed only at temperatures of 1713 K (1440 A degrees C) and above and occurred across the range of strain rates investigated, similar to 10(-5) to 10(-4) s(-1). DAGG initiates only after a critical plastic strain, which decreases with increasing temperature but is insensitive to strain rate. Following initiation of an abnormal grain, the rate of boundary migration during DAGG is on the order of 10 mm/min. This rapid growth provides a convenient means of producing large single crystals in the solid state. When significant normal grain growth occurs prior to DAGG, island grains result. DAGG was observed in sheet materials with two very different primary recrystallization textures.

• 出版日期2013-11