Advances in Titanium Technology: Poster Session
Sponsored by: TMS Structural Materials Division, TMS: Titanium Committee
Program Organizers: Yufeng Zheng, University of Nevada-Reno; Zachary Kloenne, Ohio State University; Fan Sun, Cnrs - Psl Research University; Stoichko Antonov, National Energy Technology Laboratory; Rongpei Shi, Harbin Institute of Technology

Tuesday 5:30 PM
March 1, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center

M-1: About Dislocation Density Distribution in Titanium Alloys after Hot-deformation in the α + β Domain: Matheus Brozovic Gariglio1; Nathalie Bozzolo1; Daniel Pino Muoz1; 1Mines ParisTech – PSL University, CEMEF – Centre for Material Forming
    The microstructural evolution during hot compression of Ti-6Al-4V (α + β) and Ti-10V-2Fe-3Al (metastable β) alloys was studied in order to discuss the effect of phase topology. Two initial microstructures will be presented for each alloy, with equiaxed α phase or with lamellar α phase. Deformation temperatures were set at 950C and 750C for the Ti-6Al-4V and the Ti-10V-2Fe-3Al double-cone samples, being 50C below the α + β / β phase transus temperature for each one. At these temperatures the α phase fraction of the previously mentioned alloys are 36% and 24%, respectively. The samples were deformed to an equivalent strain level of 1.3 at 0.1s-1 strain rate. Crystalline orientation maps were acquired by EBSD. Dislocation densities evaluated from the analysis of intragranular misorientations in each phase will be compared to those obtained from macroscopic flow stress analysis.

M-2: Anisotropy in Tensile Properties of Ti-10V-2Fe-3Al Metastable β Alloy : An Effect of the β Structure: Tiphaine Giroud1; Samuel Hemery1; Patrick Villechaise1; 1Institut Pprime - ENSMA
    Metastable β titanium alloys have drawn considerable attention due to their outstanding strength-to-weight ratio. In particular, the Ti-10V-2Fe-3Al alloy is extensively employed in the aircraft industry. Tensile tests at room temperature with different sampling directions highlighted a marked anisotropy which is still poorly understood. The present study focused on the role of the high fraction of β retained at room temperature. In particular, features including the β grain morphology and the crystallographic texture of the β phase were considered using scanning electron microscopy, electron back-scattered diffraction and in situ optical microscopy tensile tests combined with digital image correlation. Significant deformation and damage heterogeneities have been observed in relation to the crystallographic orientation of the β phase and the slip length within β grains. The outcomes of this study demonstrate that the millimeter-sized β grains primarily govern the mechanical anisotropy in Ti-10V-2Fe-3Al.

M-4: Microstructural Evolution and Mechanical Properties of Additively Manufactured Commercially-pure Grade 2 Titanium after Post-process Heat Treatment: Ralf Fischer1; Greyson Harvill1; Hossein Talebinezhad1; Barton Prorok1; 1Auburn University
    Additive manufacturing is becoming a preferred manufacturing method for small batch manufacturing. Titanium-based AM is often chosen as a material for many applications. Much of the ongoing titanium-based AM research has focused Ti6Al4V due to its exceptional strength and heat treatability. However, commercially pure titanium can offer enhanced corrosion resistance as well as offer enhanced ductility. This alloy has not received a lot of attention with regards to AM processing. This work investigates the processability of Grade 2 Titanium through the Laser-Powder Bed Fusion process. The microstructural evolution of the alloy was characterized through three different heat treatments and the mechanical properties were determined. Lastly, fractography of the broken specimens were conducted to gain insight into the fracture mechanism.

M-5: Microstructure in the Selective Laser Melted Ti-48Al-2Cr-2Nb Alloy: Dian Li1; Wenrui Zhao1; Xing Zhang2; Yiliang Liao2; Yufeng Zheng1; 1University of Nevada, Reno; 2Iowa State University
    Additive manufacturing opens new avenues for manufacturing the near-net-shape TiAl components with complex geometries, which serve as a promising structural material for aerospace applications. Our recent study indicated that decorating the additive manufacturing powders with graphene oxide sheets can help solve the cracking issue associated with select laser melting of Ti-48Al-2Cr-2Nb (at.%, Ti-4822). In this presentation, we will introduce our 3D characterization using FIB-SEM tomography to study the microstructural evolution and the defect formation during select laser melting of Ti-4822 and graphene oxide added Ti-4822. We observed micro-scale cracks and sub-micron pores in different morphologies in the as-printed Ti-4822 but only nano-scale pores with dramatically reduced size and number density in the graphene oxide added Ti-4822. The experimental data collected from 3D FIB-SEM tomography revealed that graphene oxide can improve the manufacturability of Ti-4822.

M-7: Young Modulus and Micro-characterization of Ternary Titanium Alloys for Biomedical Applications: Marcos da Silva1; Carlos Grandini2; Raul de Arajo1; Pedro Bazaglia Kuroda2; 1IFSP; 2Unesp
    Ti-20Zr-xMo and Ti-10Zr-yMo alloys system are promissing alloys for biomaedical applications, because they have no cytotoxic elements. The alloys were melted using an arc-melting furnace with a non-consumable tungsten electrode and water-cooled copper crucible, in argon-controlled atmosphere and, hot-rolled in order to obtain the samples for elastic modulus test. The materials characterization was made by x-ray diffraction , optical microscopy and scanning electron microscopy measurements. The measurements of elastic modulus were performed using dynamic mechanical analyzer and free decay vibrations . The results of XRD and SEM micrographs showed that in the prepared alloys have coexistence of alpha’, alpha’’ and beta phases, showing the beta stabilizing character of the added elements in alloys and for the elastic modulus, it can be observed that the addition of the solute in the two systems decreases the Young modulus. (Financial support: CNPq and FAPESP).