Titanium is the same vegetarian isomer, melting point of 1720 ℃, in less than 882 ℃ when the dense row of six square lattice structure, called Alpha Titanium, in 882 ℃ above the body heart cubic character structure, called beta Titanium. Using the different characteristics of the above two structures of titanium, the appropriate alloy elements are added so that the phase change temperature and phase content change gradually and the titanium alloys (titanium alloys) of different tissues are obtained. At room temperature, titanium alloys have three matrix tissues, and titanium alloys are divided into the following three categories: Alpha alloys, (alpha + Beta) alloys and beta alloys.
China is represented by TA, TC and TB, respectively.
Alpha Titanium Alloy It is a single congruence gold composed of alpha-phase solid solute, whether at the general temperature or at a higher actual application temperature, are alpha phase, stable tissue, wear resistance higher than pure titanium, strong antioxidant capacity.
At the temperature of 500℃~600℃, its strength and creep resistance are maintained, but heat treatment can not be enhanced, and the strength of room temperature is not high.
Beta Titanium Alloy
It is a single congruence gold composed of beta-phase solid solute, which has high strength without heat treatment, further strengthened after quenching and aging, and the strength of room temperature can reach 1372~1666mpa, but the thermal stability is poor and should not be used at high temperature.
Alpha + Beta Titanium alloy It is a double-phase gold, with good comprehensive performance, good organizational stability, good toughness, plasticity and high temperature deformation performance, can be better thermal pressure processing, can be quenched, aging to make the alloy reinforcement.
The strength after heat treatment is about 50%~100% higher than that of annealing, and the high temperature strength can work for a long time at 400℃~500℃ temperature, and its thermal stability is lower than that of Alpha titanium alloy. Alpha Titanium alloy and Alpha + Beta titanium alloy are the most commonly used in three kinds of titanium alloys; Alpha Titanium alloys have the best cutting processability, followed by Alpha + Beta titanium alloy and the worst beta-titanium alloys.
Alpha Titanium Alloy code-named Ta,β Titanium alloy code-named Tb,α+β Titanium alloy codenamed TC. Titanium alloys can be divided into heat resistant alloy, high-strength alloys, corrosion-resistant alloys (titanium-molybdenum, titanium-palladium alloys, etc.), low-temperature alloys and special functional alloys (titanium-iron hydrogen storage materials and titanium-nickel memory alloys).
The composition and properties of typical alloys are shown in the table. Heat-treated titanium alloys can obtain different phase compositions and tissues by adjusting the heat treatment process. It is generally considered that the small isometric microstructure has good plasticity, thermal stability and fatigue strength, the needle-like tissue has high lasting strength, creep strength and fracture toughness, and the isometric and needle mixed tissues have good comprehensive performance.
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