Strategies for Improving Ductility of Cryomilled Nanostructured Titanium

Ertörer, Osman; Topping, Troy D.; Li, Ying; Zhao, Yong Hao; Moss, Wes; Lavernia, Enrique J.

doi:10.4028/www.scientific.net/MSF.633-634.459

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Home Materials Science Forum Ductility of Bulk Nanostructured MaterialsStrategies for Improving Ductility of Cryomilled...

Strategies for Improving Ductility of Cryomilled Nanostructured Titanium

Abstract:

The room temperature tensile behavior of commercially pure titanium (CP-Ti), cryomilled under different conditions and forged quasi-isostatically into bulk form, was studied in detail. The results demonstrate that the ductility of cryomilled titanium can be improved, and that the mechanical properties can be tailored using three specific strategies: the use of liquid argon as cryomilling media, introduction of coarse grained regions, and low temperature heat treatment. Cryomilling in a liquid argon environment, which differs from the widely used nitrogen cryogenic environment, was found to have a particularly strong influence on ductility, as it prevents nitrogen embrittlement. The contribution of coarse grains and heat treatment to ductility are also introduced and discussed using a comparative approach.

Info:

Periodical:

Materials Science Forum (Volumes 633-634)

Main Theme:

Ductility of Bulk Nanostructured Materials

Edited by:

Yonghao Zhao and Xiaozhou Liao

Pages:

459-469

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.633-634.459

Citation:

O. Ertörer et al., "Strategies for Improving Ductility of Cryomilled Nanostructured Titanium", Materials Science Forum, Vols. 633-634, pp. 459-469, 2010

Online since:

November 2009

Authors:

Osman Ertörer, Troy D. Topping, Ying Li, Yong Hao Zhao, Wes Moss, Enrique J. Lavernia

Keywords:

Commercially Pure Titanium, Cryomilling, Low Temperature Heat Treatment, Multi-Modal Microstructure, Quasi-Isostatic Forging

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Paper TitlePages

Tensile Properties of Martensitic Stainless Steel Weldments

Authors: R. Yilmaz, Ali Türkyilmazoglu

Abstract: In this study, AISI 420 martensitic stainless steels were welded by GTAW (gas tungsten arc welding) using ER 316L consumables. Pure argon, argon + 25% He and argon + 5% N2 were used as shielding gases. The obtained results indicated that shielding gases have some effect on the properties of the martensitic stainless steel weldments. The use of argon+5%N2 provides the highest tensile strength values and higher microhardness profile compared to the other shielding gas composition used.

319

Argon-Arc Welding of Cu/Ti₃AlC₂ Cermet

Authors: Hua Zhang, Hong Xiang Zhai, Zhen Ying Huang, Shi Bo Li

Abstract: Joining of Cu/Ti3AlC2 cermet by an argon-arc welding technique without filler was firstly investigated. The results show that the Cu/Ti3AlC2 cermet can be joined firmly. The joining strength at room temperature was measured to be 851 MPa after optimization of the welding parameters with 2.6 A/mm2 for arc current density, 5 s for arc time, 10.8 kPa for applied pressure and 12 V for arc voltage. The microstructure in welded zone shows that fine TiCx particles uniformly dispersed in a network structure of Cu-Al alloys. This feature endows the Cu/Ti3AlC2 cermet with the high joining strength.

1001

Microstructure and Tensile Properties of ODS Ferritic Steels Produced by Mechanical Alloying in Argon and Hydrogen Gas Environments

Authors: Noriyuki Y. Iwata, Ryuta Kasada, Akihiko Kimura, Takanari Okuda, Masaki Inoue, Fujio Abe, Shigeharu Ukai, Somei Ohnuki, Toshiharu Fujisawa

Abstract: Two types of oxide dispersion strengthened (ODS) ferritic steels have been produced by mechanical alloying (MA) either in argon or in hydrogen atmosphere, and vacuum hot pressing (VHP). A drastic reduction in the oxygen and nitrogen contents after VHP was strongly affected by hydrogen gas used as the MA atmosphere. MA in hydrogen was found to be effective for refining the steel matrix and enhancing the tensile ductility of the ODS ferritic steels.

166

Fatigue Damage Mechanism of Titanium in Inert Environments

Authors: Nur Ismarrubie Zahari, H. Yussof, M. Sugano

Abstract: The fatigue damage of titanium has been studied on thin plate specimens subjected to alternating plane bending in argon gas. Fatigue strength in argon gas at Nf = 108 cycles was obtained to be 102 MPa. Fatigue behavior of titanium in argon gas has been attributed to the degradation of grain boundary cohesion with argon gas atoms/molecules. Fatigue cracks were propagated partly in intergranular mode. It has been plausible that argon gas atoms/molecules could penetrate into the distorted regions close to grain boundary through lattice defects and degrade grain boundary cohesion. Grain boundaries have been preferentially damaged in argon gas. The results in argon gas have been compared with those obtained in vacuum and in air.

225

Effect of Sintering Conditions on Mechanical Properties and Microstructure of Titanium Alloy Produced by Metal Injection Moulding (MIM)

Authors: Muhammad Jabir bin Suleiman Ahmad, Ahmad Nizam bin Abdullah, Rosdi Bin Ibrahim, Mazlan Mohamad, Noorhayaty Binti Abu Kasim, Mohammed Rafiq Bin Dato’Abdul Kadir, Shamsul Muhamad, Yoshinori Itoh, Kotaro Hanada, Toru Shimizu

Abstract: Metal Injection Moulding (MIM) is an efficient method for high volume production of complex shape components from powders. The purpose of this study is to determine the sintering condition of titanium alloy (Ti6Al4V) tensile shape sample. In high temperature, Ti6Al4V will react with oxygen to form of titanium oxide (TiO₂) which present a problem during sintering thus affected the mechanical properties and microstructure. This reaction can be avoided either by introducing argon gases or in vacuum condition. Ti6Al4V with binder formulation consist of polyethylene (PE), paraffin wax (PW), stearic acid (SA) and palm oil derivatives; palm stearin (PS) were mixed homogenously and injected to produce green compact. The binders then are removed and sintered at 1100 °C for 8 h. During sintering, the debound part is heated, thus allowing densification of the powder into a dense solid with the elimination of pores. It was expected that the impurity gas in argon had strong effects on aspects of the densification and properties. Samples of PE/PS formulation with argon added to the sintering atmosphere, experience density of 4.375g/cm₃ and tensile strength stated at 1000.100MPa compared to samples in vacuum condition which do not show any significant increment with density of 3.943g/cm₃ and tensile strength at 325.976MPa. PE/PW/SA samples of vacuum condition also show no improvement in sintered properties. However with additional argon flow the density can reach until 4.359g /cm₃ and 940.823MPa of tensile strength. Ti-alloy sintered in argon exhibited better densification rate than in vacuum with high strength, better elongation and lower porosity. In argon, the powder particles became interconnected signifying densification was achieved due of non-reactive properties of inert gases that prevent undesirable chemical reactions from taking place.

164