Scholarlink

<p>The high thermal gradient and solidification velocity associated with the laser powder bed fusion process spurs formation of diverse microstructures in additively manufactured materials. This study focused on the phase composition observed in the microstructure of a laser-processed metastable titanium–niobium alloy. Through transmission electron microscopy experiments, we reveal the microstructures with several metastable phase, among which is a novel orthorhombic phase found in Nb-lean regions that is fundamentally different from the expected <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40830_2025_540_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\({\alpha }^{{\prime}{\prime}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi>α</mi> </mrow> <mrow> <mo>′</mo> <mo>′</mo> </mrow> </msup> </math></EquationSource> </InlineEquation> orthorhombic phase. Second is the <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40830_2025_540_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\({O}{\prime}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>O</mi> <mo>′</mo> </mrow> </math></EquationSource> </InlineEquation> phase and the <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40830_2025_540_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\({O}{\prime}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>O</mi> <mo>′</mo> </mrow> </math></EquationSource> </InlineEquation> variant selection phenomenon in laser-processed metastable β-Ti alloys. Microstructural features were found to be highly sensitive to the processing history. We further examine the mechanisms behind these phase formations and discuss how these features can influence the properties of the alloy.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Heterogeneous Microstructure in Laser-Processed Metastable Ti25Nb Alloy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月14日

查看全文
  • Wenhao Lin,
  • Abayomi Adewale Akinwande,
  • Eric Hoglund,
  • Helge Heinrich,
  • Ji Ma

摘要

The high thermal gradient and solidification velocity associated with the laser powder bed fusion process spurs formation of diverse microstructures in additively manufactured materials. This study focused on the phase composition observed in the microstructure of a laser-processed metastable titanium–niobium alloy. Through transmission electron microscopy experiments, we reveal the microstructures with several metastable phase, among which is a novel orthorhombic phase found in Nb-lean regions that is fundamentally different from the expected \({\alpha }^{{\prime}{\prime}}\) α ′ ′ orthorhombic phase. Second is the \({O}{\prime}\) O ′ phase and the \({O}{\prime}\) O ′ variant selection phenomenon in laser-processed metastable β-Ti alloys. Microstructural features were found to be highly sensitive to the processing history. We further examine the mechanisms behind these phase formations and discuss how these features can influence the properties of the alloy.