通过选择性激光熔化制备Cu-Al-Mn-Ti形状记忆合金及其纳米沉淀强化

Fabrication of Cu-Al-Mn-Ti Shape Memory Alloys via Selective Laser Melting and Its Nano-Precipitation Strengthening.

作者信息

He Lijun, Li Yan, Su Qing, Zhao Xiya, Jiang Zhenyu

机构信息

Hubei Engineering Research Center for BDS-Cloud High-Precision Deformation Monitoring, Artificial Intelligence School, Wuchang University of Technology, Wuhan 430223, China.

Institute for Advanced Marine Research, China University of Geosciences, Guangzhou 511462, China.

出版信息

Micromachines (Basel). 2025 Jul 25;16(8):857. doi: 10.3390/mi16080857.

DOI:10.3390/mi16080857

PMID:40872365

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12388566/

Abstract

A Cu-11.85Al-3.2Mn-0.1Ti shape memory alloy (SMA) with excellent superelasticity and shape memory effect was successfully fabricated via selective laser melting (SLM). Increasing the energy density enhanced grain refinement, achieving a 90% refinement rate compared to cast alloy, with an average width of ~0.15 µm. Refined martensite lowered transformation temperatures and increased thermal hysteresis. Nanoscale CuTiAl phases precipitated densely within the matrix, forming a dual strengthening network combining precipitation hardening and dislocation hardening. This mechanism yielded a room-temperature tensile strength of 829.07 MPa, with 6.38% fracture strain. At 200 °C, strength increased to 883.68 MPa, with 12.26% strain. The maximum tensile strength represents a nearly 30% improvement on existing laser-melted quaternary Cu-based SMAs.

摘要

通过选择性激光熔化（SLM）成功制备了一种具有优异超弹性和形状记忆效应的Cu-11.85Al-3.2Mn-0.1Ti形状记忆合金（SMA）。提高能量密度可增强晶粒细化，与铸造合金相比，细化率达到90%，平均宽度约为0.15 µm。细化的马氏体降低了转变温度并增加了热滞。纳米级CuTiAl相在基体中密集析出，形成了沉淀强化和位错强化相结合的双重强化网络。这种机制产生了室温拉伸强度为829.07 MPa，断裂应变为6.38%。在200°C时，强度增加到883.68 MPa，应变为12.26%。最大拉伸强度比现有的激光熔化四元铜基形状记忆合金提高了近30%。