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                <term xml:lang="en">Interface structure</term>
                <term xml:lang="en">Interface migration</term>
                <term xml:lang="en">Titanium alloys</term>
                <term xml:lang="en">In-situ TEM</term>
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              <p>While the precipitation of α (hcp) from β (bcc) in various Ti alloys has been investigated in great detail, less is known about the precipitation of β from α. This study conducts a systematic investigation of structures and migrations of interfaces between β precipitates and α′ matrix in a Ti-2.6 wt% Mo alloy. Utilizing conventional and highresolution transmission electron microscopy (TEM), assisted with molecular dynamics and generalized O-element analysis approaches, we unveil the dislocation and atomic structures of three typical portions of the interface surrounding a β precipitate, i.e., the habit plane, the side facet, and the end face. The habit plane of β precipitates contains two sets of dislocations with Burgers vectors b$_1$ = [$2\overline{11}3$]$_α$ / 6 |[$1\overline1 1$]$_β$ / 2 and b$_4$ = [$2\overline{113}$]$_α$ / 6|[$11\overline1$]$_β$ /2, in contrast to the single set of b1 dislocations previously found on the habit plane of α laths precipitated from β matrix in various Ti alloys. Interface migrations during shrinkage of β precipitates are characterized via in-situ TEM, showing that both the habit plane and side facet migrate through the lateral motion of nanometer-high growth ledges. The dislocation structures of various growth ledges were obtained through generalized O-element calculations, suggesting a potential nonconservative dislocation trajectory as semicoherent growth ledges sweep across the interface.</p>
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            <ref type="url">http://www.cnrs.fr/inc</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-448187" status="VALID">
          <idno type="IdRef">026388820</idno>
          <idno type="ISNI">0000000121766169</idno>
          <idno type="ROR">https://ror.org/033p9g875</idno>
          <orgName>Institut National Polytechnique (Toulouse)</orgName>
          <orgName type="acronym">Toulouse INP</orgName>
          <desc>
            <address>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.inp-toulouse.fr/</ref>
          </desc>
          <listRelation>
            <relation active="#struct-443875" type="direct"/>
          </listRelation>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>