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The main classification of titanium alloy

Nov 08, 2018

Titanium is an allotrope with a melting point of 1668 ° C. It is a close-packed hexagonal lattice structure below 882 ° C and is called α titanium. It is a body-centered cubic lattice structure above 882 ° C and is called β titanium. Titanium alloys with different microstructures are obtained by adding appropriate alloying elements and gradually changing the phase transition temperature and phase content by using the different characteristics of the above two structures of titanium. At room temperature, titanium alloys have three kinds of matrix structures, and titanium alloys are classified into the following three types: α alloys, (α + β) alloys and β alloys. China is represented by TA, TC, and TB respectively.

1, α titanium alloy

It is a single-phase alloy composed of α-phase solid solution. It is α phase at normal temperature or at a higher practical application temperature. It is structurally stable and has higher wear resistance than pure titanium and has strong antioxidant capacity. The strength and creep resistance are maintained at a temperature of 500 ° C to 600 ° C, but the heat treatment is not strengthened, and the room temperature strength is not high.

2, beta titanium alloy

It is a single-phase alloy composed of β-phase solid solution. It has high strength without heat treatment. After quenching and aging, the alloy is further strengthened. The room temperature strength can reach 1372~1666 MPa. However, the thermal stability is poor and should not be used at high temperature. .

3, α + β titanium alloy

It is a two-phase alloy with good comprehensive properties, good structural stability, good toughness, plasticity and high temperature deformation properties. It can perform hot pressure processing well, and can be quenched and aged to strengthen the alloy. The strength after heat treatment is about 50% to 100% higher than the annealing state; the high temperature strength is high, and it can work for a long time at a temperature of 400 ° C to 500 ° C, and its thermal stability is inferior to that of the α titanium alloy.

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