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# Low-Angle Twist Phase Boundary Mediated Plasticity in a High-Strength Ti78Fe22 Alloy

## Details

**Authors** Zhen-Di Zhang, Xiao-Gang Wang, Hui-Chao Wang, Zhao-Zhi Xu, Lu Lu, Shao-Bo Mi, Jian-Bing Qiang, Ying-Min Wang

**Year** 2026

**Publisher** Metals

**Kind of work** article

**Discipline** Materials Science

[Read it at the publisher](https://doi.org/10.3390/met16091012) 
10.3390/met16091012

## In authors' words

### What they set out to do (purpose)

To characterize the microstructure and deformation mechanism responsible for the combination of high strength and large plastic strain in an aged Ti78Fe22 alloy.

### Who or what was studied (sample)

An aged Ti78Fe22 (titanium-iron) alloy, characterized microstructurally and mechanically tested at room temperature.

### How they did it (methods)

Electron microscopy characterization of an A2+B2-type superalloy microstructure combined with room-temperature mechanical testing to link the low-angle twist boundary between ultrafine B2-TiFe particles and the beta-Ti matrix to the observed slip and strain behavior.

### What they found (results)

Ultrafine B2-TiFe particles form low-angle twist boundaries with the surrounding beta-Ti matrix that act as a continuous dislocation source, producing dense parallel slip and yielding a strength of 1590±5 MPa together with 40±2% plastic strain at room temperature.

## Commentary

### In short

The low-angle twist boundary is a Distinction (D) — a crystallographic interface — that plays a causal Relationship (R) role as the source generating and organizing the dislocations responsible for the alloy's plasticity.

**Patterns it shows** D, R

**Added** 2026-09-16

**How to cite this** Zhen-Di Zhang, Xiao-Gang Wang, Hui-Chao Wang, Zhao-Zhi Xu, Lu Lu, Shao-Bo Mi, Jian-Bing Qiang, Ying-Min Wang (2026). Low-Angle Twist Phase Boundary Mediated Plasticity in a High-Strength Ti78Fe22 Alloy. Metals.