ISSN:
1573-8973
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. AT3, AT4, AT6, and AT8 alloys of the Ti−Al−Cr−Fe−Si−B system have high resistance to rupture and satisfactory plasticity in the forged state. 2. The resistance to rupture of the forged and quenched alloys increases with the concentration of aluminum, while the plasticity decreases. 3. The resistance to rupture and the hardness of the alloys (with the exception of the AT8 alloy) change very little at high temperatures, while the reduction of area increases as long as the quenching temperature is below the limit of the two-phase region on the phase diagram. Above this temperature the reduction of area decreases sharply because of the formation of the β- and α′-phases and the growth of grains. 4. To obtain the optimum combination of strength and plasticity as the result of quenching in air, we recommend the following quenching temperatures: 800–850°C for the AT3 alloy, 850–870°C for the AT4 alloy, 850–875°C for the AT6 alloy, and 925–950°C for the AT8 alloy. 5. Aging at 400, 450, or 550°C for 100 h does not induce any significant change of the structure or the mechanical properties of quenched alloys, which indicates that they have high thermal stability. 6. In quenched alloys the increase of the concentration of oxygen up to a certain limit has very little effect on the plasticity or resilience. However, aging of alloys with high concentrations of oxygen induces susceptibility to embrittlement.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00650703
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