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The difference between pure titanium and titanium alloys

2024-01-03

Pure titanium
  
Or industrial pure titanium or commercial pure titanium, it is classified according to the content of impurity elements. It has excellent stamping process performance and welding performance, is not sensitive to heat treatment and microstructure type, and has a certain strength under satisfactory plastic conditions. Its strength mainly depends on the content of interstitial elements oxygen and nitrogen. The performance of 99.5% industrial pure titanium is: density P=4.5g/cm3, melting point 1800 ° C, thermal conductivity coefficient λ= 15.24W/(M.K), tensile strength σ  B=539MPa, elongation: δ = 25%, reduction in area ψ= 25%, elastic modulus E=1.078 × 105MPa, hardness HB195.
  
Titanium alloy
  
Titanium alloy is an alloy based on titanium and composed of other elements. It is a relatively young metal with a history of only sixty or seventy years since its discovery. Titanium alloy materials have the characteristics of light weight, high strength, low elasticity, high temperature resistance, and corrosion resistance, and are mainly used in components such as aviation engines, rockets, and missiles. Titanium has two types of homogenous and heterogeneous crystals. Titanium is a homoisomer with a melting point of 1720 ° C and a dense hexagonal lattice structure below 882 ° C, known as a titanium; At temperatures above 882 ° C, it exhibits a body centered cubic lattice structure, known as B titanium. By utilizing the different characteristics of the two structures mentioned above, appropriate alloying elements are added to gradually change the phase transition temperature and phase content, resulting in titanium alloys with different microstructures.
  
Titanium alloy elements can be divided into three categories based on their influence on phase transition temperature: ① Stable phase A, elements that increase phase transition temperature are stable elements such as aluminum, magnesium, oxygen, and nitrogen. Aluminum is the main alloying element of titanium alloy, which has a significant effect on improving the room temperature and high temperature strength of the alloy, reducing specific gravity, and increasing elastic modulus The element that stabilizes the B phase and reduces the phase transition temperature is the B stable element. It can also be divided into two types: isomorphic type and eutectoid type. The former includes molybdenum, niobium, vanadium, etc.; the latter includes chromium, manganese, copper, silicon, etc Neutral elements such as zirconium and tin have little effect on the phase transition temperature.

 

 

 

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