Effects of Aging Heat Treatment on the Microstructure of Ti-Nb and Ti-Nb-Sn Alloys Employed as Biomaterials

2011 ◽  
Vol 324 ◽  
pp. 61-64 ◽  
Author(s):  
Eder S.N. Lopes ◽  
Alessandra Cremasco ◽  
Rodrigo Contieri ◽  
Rubens Caram
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Titanium Alloys ◽  
Phase Transformations ◽  
Aging Heat Treatment ◽  
Α Phase ◽  
High Temperature Xrd ◽  
Highly Sensitive ◽  
Effects Of Aging

The mechanical behavior of β titanium alloys applied as orthopedic biomaterials depends directly on their microstructural features, and can be improved by tailoring the microstructure through the control of their phase transformations. The aim of this investigation is to discuss phase transformations during the aging heat treatment of β Ti-30Nb and β Ti-30Nb-2Sn alloys and to correlate microstructure and mechanical behavior. The results of high temperature XRD experiments showed decomposition of orthorhombic α” phase, followed by the precipitation of ω and α phases. The mechanical behavior of Ti-Nb and Ti-Nb-Sn alloys was found to be highly sensitive to the microstructural changes caused by the addition of Sn and by heat treatments.

scholarly journals Eliminating continuous grain boundary α phase in laser melting deposited near β titanium alloys by heat treatment

2019 ◽  
Vol 563 ◽  
pp. 022025
Author(s):  
Penglin Li ◽  
Changmeng Liu ◽  
Jie Wang ◽  
Jiping Lu ◽  
Shuyuan Ma ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Titanium Alloys ◽  
Laser Melting ◽  
Α Phase

scholarly journals Effect of Heat treatment on Microstructure and Mechanical Properties of Ti-6Al-2Zr-1Mo-1V Bar

2020 ◽  
Vol 321 ◽  
pp. 11046
Author(s):  
Xu Enen ◽  
Tian Yanwen ◽  
Hao Fang ◽  
Cu Linin ◽  
Du Yuxuan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
High Temperature ◽  
Microstructure Evolution ◽  
Second Stage ◽  
Β Phase ◽  
Α Phase ◽  
Duration Time ◽  
Stage Heat Treatment

In this paper, the microstructure evolution and mechanical properties fluctuation of Ti-6Al-2Zr-1Mo-1V forging state bar after the first stage heat treatment at 950℃~955℃ and the second stage heat treatment at 760℃~840℃ were studied. In the first stage of heat treatment, the content of primary α and the tensile strength decreases with the increase of temperature, and the high temperature duration time is obviously prolonged. During the second stage of heat treatment, the metastable β phase precipitates third α phase, and with the increase of temperature, the tensile strength increases and the high temperature duration time prolongs.

Multi-Scale Microstructure Regulation Technology of Near-α High Temperature Titanium Alloy

2019 ◽  
Vol 944 ◽  
pp. 92-98
Author(s):  
Xu Qiao ◽  
Bo Long Li ◽  
Tong Bo Wang ◽  
Zuo Ren Nie
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
High Temperature ◽  
Process Analysis ◽  
Solution Treatment ◽  
Solution Temperature ◽  
Microstructure And Properties ◽  
Equiaxed Structure ◽  
Α Phase ◽  
Α2 Phase

The served harsh environment of advanced aircraft engine puts forward higher requirements for high temperature titanium alloy performance. The optimized heat treatment technology provides effective theoretical basis for improving the microstructure and properties of high temperature titanium alloys. In this paper, we study the influence of different heat treatment systems on microstructure and mechanical properties of high temperature alloy with equiaxed structure, in order to obtain the corresponding relationship between the process and the microstructure performance of the alloy and the optimal heat treatment process. Analysis the effect of solution treatment on the primary α phase quantitatively by optical microscope and Image-Pro-Plus 6.0 software based on the forged high temperature titanium alloy in α+β phase region. Observe the precipitation of α2 phase and silicide by TEM, optimize the aging process according to hardness test. The results show that the content of primary a phase decrease from 63.3% at 920°C to 15.3% at 990°C with the increase of solution temperature. When the temperature rises to 980~990°C, the structure changes from equiaxed structure to α+β duplex microstructure. And change into lamellar structure when the solution temperature raise to 1010°C. The secondary α phase precipitates more fully when the aging temperature increases. And with increasing aging time, the trend of α2 phase growth become more significantly. The optimum heat treatment system obtained in this experimental is 990°C/1h/AC+700°C/5h/AC, and the α phase is about 15.3%. Hence, the excellent microstructure and properties match has been obtained.

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