He Lijun, Li Yan, Su Qing, Zhao Xiya, Jiang Zhenyu
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.
Micromachines (Basel). 2025 Jul 25;16(8):857. doi: 10.3390/mi16080857.
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.
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%。
