Microstructure characterization and mechanical property of short-duration hot pressing assisted additive manufacturing TiB₂/AlSi10Mg alloy

TY - JOUR

T1 - Microstructure characterization and mechanical property of short-duration hot pressing assisted additive manufacturing TiB2/AlSi10Mg alloy

AU - Xiong, Lingda

AU - Liang, Zhiqiang

AU - Zhang, Mingyang

N1 - Publisher Copyright: © 2024

PY - 2025/12

Y1 - 2025/12

N2 - TiB2-reinforced AlSi10Mg composites via laser powder bed fusion (LPBF) faces a critical challenge: eliminating porosity without sacrificing the fine microstructure essential for strength. This study introduces a novel short-duration hot pressing technique (SdPH) that resolves this dilemma. Unlike conventional hot isostatic pressing, SdPH employs uniaxial pressure (10 MPa) at moderated temperatures for ≤1 min, exploiting the disparity between pore closure and diffusion-driven coarsening. Multiscale characterization reveals that SdPH reduces porosity from 0.394 % to 0.294 %, while retaining the as-built microstructure (nanoscale Si precipitates and full-cellular structure). SdPH -AlSi10Mg/TiB2 sample exhibited good mechanical properties with a yield strength of 267 MPa, an ultimate tensile strength of 457 MPa, and an elongation of 4.6 %. This work redefines post-AM processing paradigms, proving that transient thermomechanical coupling can overcome the longstanding trade-off between densification and microstructural degradation during heat treatment.

AB - TiB2-reinforced AlSi10Mg composites via laser powder bed fusion (LPBF) faces a critical challenge: eliminating porosity without sacrificing the fine microstructure essential for strength. This study introduces a novel short-duration hot pressing technique (SdPH) that resolves this dilemma. Unlike conventional hot isostatic pressing, SdPH employs uniaxial pressure (10 MPa) at moderated temperatures for ≤1 min, exploiting the disparity between pore closure and diffusion-driven coarsening. Multiscale characterization reveals that SdPH reduces porosity from 0.394 % to 0.294 %, while retaining the as-built microstructure (nanoscale Si precipitates and full-cellular structure). SdPH -AlSi10Mg/TiB2 sample exhibited good mechanical properties with a yield strength of 267 MPa, an ultimate tensile strength of 457 MPa, and an elongation of 4.6 %. This work redefines post-AM processing paradigms, proving that transient thermomechanical coupling can overcome the longstanding trade-off between densification and microstructural degradation during heat treatment.

KW - Densification, short-duration hot pressing technique

KW - Heat resistance

KW - Laser powder bed fusion

KW - Mechanical property

KW - Microstructure characterization

UR - https://www.scopus.com/pages/publications/105021257080

U2 - 10.1016/j.matchar.2025.115771

DO - 10.1016/j.matchar.2025.115771

M3 - Article

AN - SCOPUS:105021257080

SN - 1044-5803

VL - 230

JO - Materials Characterization

JF - Materials Characterization

M1 - 115771

ER -