Biomedical titanium alloys can be classified according to the microscopic structure of the materials. α Type, α+β Type, and β Titanium alloy type III. At present, pure titanium and Ti-6Al-4V alloy are still widely used in clinical practice. but β Titanium-type alloys have become a hot research topic in this field due to their lower elastic modulus and better biocompatibility. It is the most promising biomedical titanium alloy.
Table 1 shows the mechanical properties of various biomedical titanium alloys. Figure 1 shows a comparison of the elastic modulus of various biomedical alloys with that of human bones. As you can see, The elastic modulus of the second generation biomedical titanium is significantly lower than that of the first generation. There is an increasing trend in Nb content in alloy design and both are β Titanium alloy types, Ti-35Nb-7Zr-5Ta and Ti-29Nb-13Ta-7.1Zr alloys have the lowest elastic modulus of 55MPa, which is the closest to that of human bones. therefore, the development of biomedical materials with low elastic modulus β Ti-type alloy has become a research hotspot in this field. Biomedical hyperelasticity, the most widely studied at home and abroad β Titanium alloy is ti NB hyperelastic β Titanium alloy.
Table 1 Mechanical Properties of biomedical titanium
|
Material |
Standard |
Elastic Modulus/Gpa |
Tensile strength/Mpa |
Alloy Type |
|
First-generation biomaterials
|
||||
|
Commercially Pure Titanium |
ASTM 1341 |
100 |
240-550 |
a |
|
Ti-6Al-4V Forged and rolled piece |
ASTM F136 |
110 |
860-965 |
a+β |
|
Ti-6Al-4V Standard Level |
ASTMF1472 |
112 |
895-930 |
a+β |
|
Ti-6AI-7Nb |
ASTM F1295 |
110 |
900-1050 |
a+β |
|
Ti-5Al-2.5Fe |
110 |
1020 |
a+β |
|
|
Second and third-generation biomaterials
|
||||
|
Ti-13Nb-13Zr |
79-84 |
973-1037 |
Metastable β |
|
|
Ti-12Mo-6Zr-2Fe |
74-85 |
1060-1100 |
β |
|
|
Ti-35Nb-7Zr-5Ta |
55 |
596 |
β |
|
|
Ti-29Nb-13Ta-4.6Zr |
65 |
911 |
β |
|
|
Ti-35Nb-7Zr-5Ta-0.4o |
ASTMF1713 |
66 |
1010 |
β |
|
Ti-15Mo-5Zr-3AI |
ASTMF1813 |
82 |
β |
|
|
Ti-Mo |
ASTM F2066 |
β |
||
