Sub-transus transformation-driven softening in Ti-6Al-2Sn-4Zr-2Mo alloy additively manufactured using laser powder bed fusion

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510959" target="_blank" >RIV/00216208:11320/25:10510959 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=I9ZxsFnOdb" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=I9ZxsFnOdb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2025.148530" target="_blank" >10.1016/j.msea.2025.148530</a>

Result language

angličtina

Original language name

Sub-transus transformation-driven softening in Ti-6Al-2Sn-4Zr-2Mo alloy additively manufactured using laser powder bed fusion

Original language description

In the present work, the high-temperature phase stability and the correlated flow stress softening of Ti-6 %Al-2 %Sn-4 %Zr-2 %Mo alloy (Ti-6242) fabricated through the laser powder bed fusion process were studied. Toward this end, a set of hot compression tests were conducted at 700, 800, 900 and 1000 degrees C under the strain rate of 0.001s(-1). A distinct observation was the occurrence of a significant strength drop and notable flow softening after reaching the maximum stress at all thermomechanical conditions. The peak stress was significantly dropped (similar to 490 MPa) with increasing temperature from 700 degrees C to 800 degrees C, proposing activation of a new emerging softening mechanism. The alpha &apos; martensitic starting microstructure extensively started to decompose at around 800 degrees C, leading to the formation of alpha and beta grains, where the beta phase fraction was considerably increased by approaching the beta transus temperature. The reverse transformation of the martensite served as an effective softening mechanism, owing to the fact that the alpha and beta phases represent higher capability for strain accommodation. At 900 degrees C and 1000 degrees C, the penetration of beta phases through the alpha lamellae and the occurrence of alpha-globularization was clearly evident, contributing to the flow softening at elevated temperatures. A preferred texture towards the &lt;2-1-10&gt; and &lt;0001&gt; orientations was also recognized in the microstructure deformed at 800 degrees C and 900 degrees C, which proposed the contribution of texture weakening as an additional factor in flow softening.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Materials Science &amp; Engineering A: Structural Materials: Properties, Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Volume of the periodical

940

Issue of the periodical within the volume

neuveden

Country of publishing house

CH - SWITZERLAND

Number of pages

13

Pages from-to

148530

UT code for WoS article

001500956400001

EID of the result in the Scopus database

2-s2.0-105005841567