Titanium alloys can be divided into three types according to the composition of the phases: α alloy, (α + β) alloy, and β alloy. China is represented by TA, TC, and TB, respectively.
1. Alpha alloys contain a certain amount of elements that stabilize the alpha phase and are mainly composed of the alpha phase in equilibrium. Alpha alloy has a small specific gravity, good thermal strength, good weldability, and excellent corrosion resistance. The disadvantage is low room temperature strength, which is usually used as heat-resistant materials and corrosion-resistant materials. Alpha alloys are generally divided into full alpha alloys (TA7), near alpha alloys (Ti-8Al-1Mo-1V), and alpha alloys (Ti-2.5Cu) with a small number of compounds.
2. The β alloy contains a large number of elements that stabilize the β phase and can retain all of the high-temperature β phases to room temperature. Beta alloys are generally divided into heat-treatable beta alloys (metastable beta alloys and near metastable beta alloys) and thermally stable beta alloys. The heat-treated β alloy has excellent plasticity in the quenched state and can achieve a tensile strength of 130 to 140 kg / mm2 through aging treatment. Beta alloys are commonly used as high-strength, high-toughness materials. The disadvantages are high specific gravity, high cost, poor welding performance, and difficult cutting.
3. (α + β) alloy contains a certain amount of elements that stabilize the α phase and the β phase, and the microstructure of the alloy in the equilibrium state is the α phase and the β phase. (α + β) the alloy has medium strength and can be strengthened by heat treatment, but its welding performance is poor. (α + β) alloys are widely used, among which the output of Ti-6Al-4V alloy accounts for more than half of all titanium materials.
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1. Alpha alloys contain a certain amount of elements that stabilize the alpha phase and are mainly composed of the alpha phase in equilibrium. Alpha alloy has a small specific gravity, good thermal strength, good weldability, and excellent corrosion resistance. The disadvantage is low room temperature strength, which is usually used as heat-resistant materials and corrosion-resistant materials. Alpha alloys are generally divided into full alpha alloys (TA7), near alpha alloys (Ti-8Al-1Mo-1V), and alpha alloys (Ti-2.5Cu) with a small number of compounds.
2. The β alloy contains a large number of elements that stabilize the β phase and can retain all of the high-temperature β phases to room temperature. Beta alloys are generally divided into heat-treatable beta alloys (metastable beta alloys and near metastable beta alloys) and thermally stable beta alloys. The heat-treated β alloy has excellent plasticity in the quenched state and can achieve a tensile strength of 130 to 140 kg / mm2 through aging treatment. Beta alloys are commonly used as high-strength, high-toughness materials. The disadvantages are high specific gravity, high cost, poor welding performance, and difficult cutting.
3. (α + β) alloy contains a certain amount of elements that stabilize the α phase and the β phase, and the microstructure of the alloy in the equilibrium state is the α phase and the β phase. (α + β) the alloy has medium strength and can be strengthened by heat treatment, but its welding performance is poor. (α + β) alloys are widely used, among which the output of Ti-6Al-4V alloy accounts for more than half of all titanium materials.
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