scholarly journals Understanding the properties of low-cost iron-containing powder metallurgy titanium alloys

2016 ◽  
Vol 110 ◽  
pp. 317-323 ◽  
Author(s):  
L. Bolzoni ◽  
E.M. Ruiz-Navas ◽  
E. Gordo
Keyword(s):  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Low Cost

Fracture Toughness of Powder Metallurgy and Ingot Titanium Alloys – A Review

2013 ◽  
Vol 551 ◽  
pp. 143-160 ◽  
Author(s):  
Ajit Pal Singh ◽  
Brian Gabbitas ◽  
De Liang Zhang
Keyword(s):  
Fracture Toughness ◽  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Alloy Composition ◽  
Low Cost ◽  
Ingot Metallurgy ◽  
Metal Powders ◽  
Critical Factors ◽  
Microstructural Characteristics ◽  
High Degree

Powder metallurgy (PM) is potentially capable of producing homogeneous titanium alloys at relative low cost compared to ingot metallurgy (IM). There are many established PM methods for consolidating metal powders to near net shapes with a high degree of freedom in alloy composition and resulting microstructural characteristics. The mechanical properties of titanium and its alloys processed using a powder metallurgical route have been studied in great detail; one major concern is that ductility and toughness of materials produced by a PM route are often lower than those of corresponding IM materials. The aim of this paper is to review the fracture toughness of both PM and IM titanium alloys. The effects of critical factors such as interstitial impurities, microstructural features and heat treatment on fracture toughness are also discussed

scholarly journals Quantifying the properties of low-cost powder metallurgy titanium alloys

2017 ◽  
Vol 687 ◽  
pp. 47-53 ◽  
Author(s):  
L. Bolzoni ◽  
E.M. Ruiz-Navas ◽  
E. Gordo
Keyword(s):  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Low Cost

Interstitial Control in Titanium Alloys Produced by Powder Metallurgy

2010 ◽  
Vol 660-661 ◽  
pp. 3-10 ◽  
Author(s):  
Vinicius André Rodrigues Henriques ◽  
S.L.G. Petroni ◽  
M.S.M. Paula ◽  
Carlos Alberto Alves Cairo ◽  
Eduardo T. Galvani
Keyword(s):  
Powder Metallurgy ◽  
Titanium Alloys ◽  
High Performance ◽  
Low Cost ◽  
Cold Isostatic Pressing ◽  
Mechanical Resistance ◽  
Aerospace Applications ◽  
Surgical Implants ◽  
Critical Issues ◽  
Interstitial Elements

The titanium alloys are used for applications that demand high performance, including surgical implants and aerospace applications. Powder metallurgy is an advantageous alternative for titanium parts production with complex geometries at a relative low cost. Despite that, it is verified that the introduction of interstitial elements (oxygen, nitrogen and carbon) wile processing these alloys, though can increase hardness and mechanical resistance, which is frequently related to the reduction of ductility and fragility increase. The objective of this work is to investigate the influence of the interstitial elements in commercially pure Ti and Ti-13Nb-13Zr alloy produced by powder metallurgy (P/M). Samples were produced by the mixing of hydrided metallic powders followed by uniaxial and cold isostatic pressing with subsequent densification by sintering at 1400 °C, in vacuum. Sintered samples were characterized for phase composition, microstructure and microhardness by X-ray diffraction, scanning electron microscopy and Vickers indentation, respectively. The interstitial content was analyzed by Leco equipment. It was shown that the samples were sintered to high densities with a Widmanstatten microstructure. The oxygen and nitrogen contents are above the ELI (Extra Low Interstitial) and the critical issues were identified in the original blended elemental route.

scholarly journals Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2910
Author(s):  
Chaoyi Ding ◽  
Chun Liu ◽  
Ligang Zhang ◽  
Di Wu ◽  
Libin Liu
Keyword(s):  
Diffusion Couple ◽  
Titanium Alloys ◽  
High Throughput ◽  
Volume Fraction ◽  
Raw Materials ◽  
Low Cost ◽  
High Strength ◽  
High Yield ◽  
Α Phase ◽  
Cr System

The high cost of development and raw materials have been obstacles to the widespread use of titanium alloys. In the present study, the high-throughput experimental method of diffusion couple combined with CALPHAD calculation was used to design and prepare the low-cost and high-strength Ti-Al-Cr system titanium alloy. The results showed that ultra-fine α phase was obtained in Ti-6Al-10.9Cr alloy designed through the pseudo-spinodal mechanism, and it has a high yield strength of 1437 ± 7 MPa. Furthermore, application of the 3D strength model of Ti-6Al-xCr alloy showed that the strength of the alloy depended on the volume fraction and thickness of the α phase. The large number of α/β interfaces produced by ultra-fine α phase greatly improved the strength of the alloy but limited its ductility. Thus, we have demonstrated that the pseudo-spinodal mechanism combined with high-throughput diffusion couple technology and CALPHAD was an efficient method to design low-cost and high-strength titanium alloys.

Sign in / Sign up

Export Citation Format

Share Document