Formation mechanism of dilute region and microstructure evolution in laser solid forming TA15/Ti2 AlNb Dual Alloy

Hua Tan, Zesen Mi, Yongshuai Zhu, Zhenyu Yan, Xin Hou, Jing Chen

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

TA15/Ti2 AlNb multiple-layer samples and a dual-alloy sample were fabricated by laser solid forming (LSF) in this study. The formation mechanism of the dilute region and microstructure evolution of the dual alloy were analyzed. The results confirmed a "step" distribution of the composition among several initial layers in the multiple-layer samples, which can be explained by calculating the ratio of the remelted zone to the deposited Ti2 AlNb zone in each deposited layer. However, the "step" compositional distribution disappears, and the compositional variation tends to be more continuous and smooth in the TA15/Ti2 AlNb dual-alloy sample, which is attributed to alloy elements' diffusion at the subsequent multiple re-melting and the longer thermal cycle. The macrostructure of the TA15/Ti2 AlNb dual-alloy sample consists of epitaxially grown columnar prior β grains at the TA15 side and equiaxed grains at the Ti2 AlNb side, while the microstructure shows a transition of α+β→α+α2+β/B2→α2+B2+O with increasing amounts of Ti2 AlNb, leading to the microhardness also changing significantly.

Original languageEnglish
Article number552
JournalMaterials
Volume13
Issue number3
DOIs
StatePublished - 1 Feb 2020

Keywords

  • Dilute region
  • Laser solid forming
  • Microstructure evolution
  • TA15/Ti AlNb dual alloy

Fingerprint

Dive into the research topics of 'Formation mechanism of dilute region and microstructure evolution in laser solid forming TA15/Ti2 AlNb Dual Alloy'. Together they form a unique fingerprint.

Cite this