Titanium alloy refers to a variety of alloy metals made of titanium and other metals, high strength, good corrosion resistance, high heat resistance. Titanium alloy is widely used in the manufacture of aircraft engine compressor components, frames, skins, fasteners and landing gear. Titanium alloys are also used in the structure of rockets, missiles and high-speed aircraft.
Titanium is an isomer with a melting point of 1668℃ and a close-packed hexagonal lattice structure below 882℃, which is called alpha titanium. At 882℃ above the body - centered cubic lattice structure, called beta titanium. titanium pipe manufacturer makes use of the different characteristics of the above two structures of titanium and adds appropriate alloying elements to get titanium alloys with different structures. At room temperature, titanium alloys have three matrix structures, which can be divided into three categories: α alloy,(α+β) alloy, and β alloy. Our country is represented by TA, TC and TB.
The density of titanium alloy is generally about 4.51g/cm3, only 60% of steel, some high strength titanium alloy exceeds the strength of many alloy structure, so the ratio of strength of titanium alloy (strength/density) is far greater than other metal structural materials, can be made of high unit strength, good rigidity, light parts.
Mechanical properties of some titanium and titanium alloys
Titanium is non-toxic, light weight, high strength and excellent biocompatibility. It is a very ideal medical metal material, which can be used as implants for human body. In the United States, five beta titanium alloys have been recommended for medical use, Namely, TMZFTM (TI-12Mo-^Zr-2Fe), Ti-13Nb-13Zr, Timetal 21SRx (Ti-15Mo-2.5Nb-0.2Si), Tiadyne 1610 (Ti-16Nb-9.5Hf) and TI-15Mo, Suitable for implant in human body, such as artificial bone, vascular stent, etc.
TiNi alloy is very biocompatible, and there are quite a few medical examples using its shape memory effect and super elasticity. Such as thrombus filter, spinal orthopedic rod, dental orthopedic wire, vascular stent, bone plate, intramedullary needle, artificial joint, contraceptive, heart repair components, artificial kidney miniature pump, etc.
Titanium alloy products can be obtained by die casting and machining methods. The melting temperature of titanium alloy is very high, and the requirement for die steel is also high. There are many machining methods of titanium alloy, including: turning, milling, boring, drilling, grinding, tapping, sawing, electric discharge machining and so on.
The machinability of titanium alloy is also poor. Titanium alloy cutting cutting force is just slightly higher than the same hardness of steel, but most titanium alloy thermal conductivity is very low, only 1/7 of steel, aluminum 1/16, so the heat generated by cutting will not quickly dispersed, gathered in the cutting area, resulting in rapid wear, collapse and debris nodules.