Molybdenum News Center

TZM Alloy Carbon Fiber Strengthening and Carbide Strengthening

Carbide Strengthening
Doped with small amounts of TiC or ZrC carbides in TZM alloy can increase relative density and tensile strength of the alloy, and when the amount of carbides at 0.4%, alloy’s room temperature strength reaches the maximum value. Meanwhile, ZrC or TiC alloys can react with oxygen to produce an oxygen-containing second phase particles. These second-phase particles can reduce the porosity and the improving the strength of the alloy. In addition, the dispersed second phase particles having dispersion strengthening effect can improve alloy’s properties. Carbide can help to generate dimple during high temperature tensile process, making high temperature fracture mode change from mixed fracture mode of transgranular cleavage and dimple fracture to dimple fracture mode, thereby improving the high temperature strength of the alloy. And the same content of ZrC and TiC, ZrC can more effective improve the relative density and strength at room temperature and high-temperature.

Carbon Fiber Strengthening
Manufacturing metal-matrix TZM alloy matrix composites by powder metallurgy method, where the short carbon fiber as a reinforcing fiber and metal as matrix. Compared with metal material,    short carbon fiber reinforced metal matrix composites has a higher specific strength, modulus, which can effectively improve the properties of the alloy.

Under hydrogen atmosphere, when the heat treatment temperature is 1500 ℃, the carbon fiber surface appeared a large number of voids and pits, and nearly half of carbon fiber is ablation. Besides, tensile strength of the alloy is only 1/5. When the heat treatment temperature is raised to 1800 ℃, carbon fibers will react with hydrogen to produce methane gas and volatile disappear. Under an argon atmosphere, the heat treatment temperature is 1500 ℃, the carbon fibers and fracture has no apparent fracture crack. when the heat treatment temperature is 1800 ℃, the carbon fiber surface has small fluffy attachments and small pits and carbon fiber mass burning rate is small. Besides, the tensile strength also dropped a lot. In addition, TZM alloy has finer grain size when doped with carbon ferber.

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