Abstract
To narrow down the candidates of the alloying element powders for Ti-5Al-1Fe products manufactured with BE/PM, two master alloy powders, atomized spherical 5Al-1Fe and crushed-andground polyhedron 5Al-1Fe-4Ti ternary powders, were investigated with emphasizing on homogeneity of alloying elements, Al and Fe, in sintered Ti-5Al-1Fe. Intense Al segregation is recognized in the sintered specimen manufactured using 5Al-1Fe atomized powders, while strong segregation is not observed in the specimen manufactured using 5Al-1Fe-4Ti crushed-and-ground powders. Density of sintered specimen manufactured using 5Al-1Fe atomized powders is lower than that manufactured using 5Al-1Fe-4Ti crushed-and-ground powders. Al segregation and lower sintered density are probably caused by lower density of the powder substance, high flowability of spherical powders and phase constitutions some of which have low melting points. Those factors have to be taken into account to manufacture sintered titanium alloys with high homogeneity by BE/PM.
Highlights
To narrow down the candidates of the alloying element powders for Ti-5Al-1Fe products manufactured with Blended elemental powder metallurgy (BE/PM), two master alloy powders, atomized spherical 5Al-1Fe and crushed-andground polyhedron 5Al-1Fe-4Ti ternary powders, were investigated with emphasizing on homogeneity of alloying elements, Al and Fe, in sintered Ti-5Al-1Fe
Blended elemental powder metallurgy (BE/PM) is one of the near net shape (NNS) manufacturing methods in which pure titanium powders and alloying element powders are blended, compacted at room temperature and sintered at high temperature in vacuum. In this process, alloying process by mutual diffusion of Ti and alloying elements occurs during sintering, which contributes to reduction of the manufacturing cost in addition to the cost advantage of the near net shape process, compared to what is called the ingot metallurgy in which final products are obtained by heavy machining of the wrought materials converted from the melt ingots
The temperature is close to the melting point of Al and it is considered that Al alloy phase, which is the main phase in the powders and probably contains some amount of Fe in the form of solid solution, melted at around 649 °C
Summary
To narrow down the candidates of the alloying element powders for Ti-5Al-1Fe products manufactured with BE/PM, two master alloy powders, atomized spherical 5Al-1Fe and crushed-andground polyhedron 5Al-1Fe-4Ti ternary powders, were investigated with emphasizing on homogeneity of alloying elements, Al and Fe, in sintered Ti-5Al-1Fe. It has been applied to a wide range of application including sporting goods and automobile engine parts[1,2,3,4] Considering those circumstances, employment of BE/PM for manufacturing NNS products made of Ti-5Al-1Fe may be beneficial to further reduce the manufacturing cost. To narrow down the candidates of the alloying element powders for Ti-5Al-1Fe manufactured with BE/PM, two different master alloy powders, atomized spherical 5Al-1Fe and crushed-and-ground polyhedron 5Al-1Fe-4Ti ternary powders[9], which was proposed as one of the preferable master alloys having good grindability and meltability in crucible, were investigated from the viewpoints of homogeneity of Al and Fe in the sintered products
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