INFLUENCE OF MILLING PARAMETERS ON PARTICLE SIZE AND MICROHARDNESS OF CRYOMILLED AND SPARK PLASMA SINTERED CP Ti

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10335201" target="_blank" >RIV/00216208:11320/16:10335201 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

INFLUENCE OF MILLING PARAMETERS ON PARTICLE SIZE AND MICROHARDNESS OF CRYOMILLED AND SPARK PLASMA SINTERED CP Ti

Original language description

Ultra-fine grained (UFG) materials are in the spotlight because of their enhanced mechanical properties. UFG material can be prepared by bottom-up process consisting of agglomeration of nano-particles or by top-down process of severe plastic deformation (SPD) In this study, Ti Grade 2 powder underwent attritor milling in liquid nitrogen (LN) and argon (LAr) and was consequently consolidated via spark plasma sintering (SPS). The influence of milling liquid (LN vs. LAr), of milling balls material (stainless steel vs. tungsten carbide) and of other milling parameters (e.g. speed, duration) on size and shape of powder particles, chemical contamination and microhardness was investigated. Particle size reduction was generally not observed, while their morphology changed significantly due to simultaneous disintegration and intensive cold welding during the milling process. Using LN as a cooling medium resulted in very high nitrogen content (up to 3 wt.%), and consequent embrittlement and hardening with microhardness values attaining 800 HV. LAr seems to be more suitable for milling of titanium, but a process control agent (stearic acid) must be added to prevent excessive cold welding. Microhardness of material without nitrogen contamination rose from original 178 HV to 200-300 HV range, depending on milling efficiency.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GA15-15609S" target="_blank" >GA15-15609S: Ultrafine-grained and nanocrystalline metals with high strength prepared by pulsed electric current sintering</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

METAL 2016: 25TH ANNIVERSARY INTERNATIONAL CONFERENCE ON METALLURGY AND MATERIALS

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

1439-1444

Publisher name

TANGER LTD

Place of publication

SLEZSKA

Event location

Brno

Event date

May 25, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000391251200235