What is molybdenum alloy brittle mechanism？
Molybdenum is a bcc crystal structure, independent slip systems less stress and deformation occurs when the grain deformation capacity of poor coordination between the grain boundary prone to cracks caused by stress concentration, causing grain boundary fracture. Meanwhile, the industry uses a variety of technical preparation of molybdenum alloys contain a small amount of O, C, N and other impurities, and these residual impurities present a serious impact on the mechanical properties of molybdenum alloy component and organizational structure.
O, C, N and other impurities in the low solubility of molybdenum. These elements, oxides, carbides, nitrides form, and is precipitated in the grain boundary, including the sub-grain boundaries and dislocations around the defect including not only weaken the grain boundary strength, and hinder dislocation movement, contribute to crack generation, molybdenum alloy shows a typical room temperature brittleness.
Production practice, analyzed by AES O, C, N and other impurities on molybdenum and molybdenum alloy mechanical properties. Carbon Molybdenum strength is small, but a great impact on its elongation, such as when the carbon content increased from 10mg/kg to 20mg/kg, the electron beam melting the resulting elongation of molybdenum alloy rapidly from 10% to 45 % fully proved conducive to improving carbon molybdenum alloy plasticity; and when the carbon content continues to increase, the molybdenum alloy ductility and slow decline.
The higher oxygen content of molybdenum alloys, plastic - brittle transition temperature is also higher. Similarly with the nitrogen content increases, the critical yield stress molybdenum alloy sharp decline in its plastic - brittle transition temperature also increased sharply, indicating high levels of molybdenum alloy presence of oxygen and nitrogen can severely affect the mechanical properties of molybdenum alloys. Therefore, good control of O, C, N is to increase the content of molybdenum and molybdenum alloy machinability and expanding its scope of application of the key. By alloying, micro-alloying method can be strengthened molybdenum alloy, thereby expanding at room temperature and high temperature applications.
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