Overcoming Decomposition with Order-Reversed Quenching Obtained by Flash Melting

【摘要】 We report on an order-reversed quenching phenomenon in manganese nitrides under flash melting,which prevents the thermodynamically favorable phase transformations from occurring at high temperatures by providing a narrow window of time.The Mn-N kept un-decomposed at high temperatures generated by current up to339MA/m~2 within 60 ms.After flash melting,the Mn-N shows a significantly enhanced coercivity and a decreased crystalline size.The Mn-N samples decompose rapidly at temperatures above 1100K with time.The orderreversed quenching technique is potentially useful in processing and preventing phase transformations of metastable materials at high temperatures.更多还原

【Abstract】 We report on an order-reversed quenching phenomenon in manganese nitrides under flash melting,which prevents the thermodynamically favorable phase transformations from occurring at high temperatures by providing a narrow window of time.The Mn-N kept un-decomposed at high temperatures generated by current up to339MA/m~2 within 60 ms.After flash melting,the Mn-N shows a signiScantly enhanced coercivity and a decreased crystalline size.The Mn-N samples decompose rapidly at temperatures above 1100K with time.The orderreversed quenching technique is potentially useful in processing and preventing phase transformations of metastable materials at high temperatures.更多还原