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Adding Rhenium Element to Strengthen Titanium Zirconium Molybdenum Alloys

Titanium-zirconium molybdenum (TZM) alloys strengthening in addition to well-known molybdenum solution strengthening, dispersion strengthening and deformation strengthening. There are other strengthening ways, such as adding rhenium, carbide, rare earth oxides, staple fibers and doing neutron radiation treatment. Here will introduce adding rhenium elements to strengthen the metal titanium zirconium molybdenum alloy.
Adding alloying elements is an effective way to improve the brittleness of molybdenum. After studies rhenium effect of adding element rhenium into alloy found after adding rhenium not only improve high temperature properties of molybdenum, but and can significantly improve the performance of molybdenum at room temperature. Studies the experimental data found rhenium added to the TZM alloy can occur solution strengthening reaction with molybdenum matrix then to form solid solution grains with a certain toughness and dense. Besides, during bending break, molybdenum-rhenium solid solution mainly is transgranular fracture to absorb a lot the fracture energy, so it can effectively improve toughness at room temperature of the TZM alloy. However, there still have some drawbacks when adding rhenium to strengthen TZM alloy, namely adding rhenium will restrict titanium, zirconium in molybdenum solution strengthening so it will cause a large number of pores and second phase ions gathered in molybdenum-rhenium alloy grain boundaries to adversely affect its strength.

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