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LPBF 制备 Al-Ce-Sc-Zr 合金的 短时时效组织演化与力学性能研究
Short-term Aging StrengtheningBehaviorand MechanicalProperties of an LPBF-fabricatedAl-Ce-Sc-Zr Alloy
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- DOI:
- 作者:
- 王贝贝 1，王朦朦 1，2，3，4，王刚 1，2，刘琪 1，2，顾贤科 3，4，费翔 3，4，张志 3，4，王冬晴 3，4
WANG Beibei1,WANG Mengmeng1,2,3,4,WANG Gang1,2,LIU Qi1,2,GU Xianke3,4, FEI Xiang3,4,ZHANG Zhi3,4,WANG Dongqing3,4
- 作者单位:
- 1. 安徽工程大学，安徽 芜湖 241000；2. 增材制造(3D 打印)安徽省联合共建学科重点实验室，安徽 芜湖 241000；3. 奇瑞 汽车股份有限公司，安徽 芜湖 241000；4. 安徽开阳科技有限公司，安徽 芜湖 241000
1. Anhui Polytechnic University, Wuhu 241000,China; 2. Anhui Provincial Joint Key Laboratory of Additive Manufacturing (3D Printing), Wuhu 241000,China; 3. Chery Automobile Co., Ltd., Wuhu 241000,China; 4. Anhui Kaiyang Technology Co., Ltd., Wuhu 241000,China
- 关键词:
- Al-Ce 合金；热力学计算；激光粉末床熔融；时效
Al-Ce alloy; thermodynamic calculation; laser powder bed fusion; aging
- 摘要:
- 基于热力学计算设计了一种 Sc、Zr 微合金化的新型 Al-Ce 合金，并选取 Al-10%Ce-0.3%Sc-0.25%Zr(质量分数)作为目标成分，采用激光粉末床熔融(laser powder bed fusion, LPBF)技术进行制备。 结合 300 ℃等温时效硬化曲线，分析了合金成形态与 300 ℃时效 1h 后样品的显微组织和室温拉伸性能。 结果表明，300 ℃时效 1h 后，合金内部形成了由微米尺度 Al11Ce3 共晶相、纳米尺度 L12-Al3(Sc, Zr)析出相和纳米层错共同构成的层级组织。 与成形态相比，时效 1h后合金的屈服强度由(334.2±5.3) MPa 提高至(391.3±6.1) MPa，抗拉强度由(463.8±1.6) MPa 提高至(552.9±6.5) MPa，同时未造成明显塑性损失。其中，强度提升主要归因于 L12-Al3(Sc, Zr)析出相及层错结构对位错运动的有效阻碍，而塑性的保持则与时效过程中组织回复引起的局部应力缓解和变形协调性改善有关。Based on thermodynamic calculations, a novel Sc- and Zr-microalloyed Al-Ce alloy was designed, and Al-10 wt.% Ce-0.3 wt.% Sc-0.25 wt.% Zr was selected as the target composition. The alloy was fabricated using laser powder bed fusion (LPBF). Combined with the isothermal age-hardening curve at 300 ℃,the microstructures and room-temperature tensile properties of the as-built alloy and the sample aged at 300 ℃ for 1 h were analysed. After aging at 300 ℃ for 1 h, a hierarchical microstructure consisting of microscale Al11Ce3 eutectic phases, nanoscale L12-Al3 (Sc, Zr) precipitates, and nanoscale stacking faults is formed in the alloy. Compared with the as-built state, the yield strength increases from (334.2± 5.3) MPa to (391.3±6.1) MPa, and the ultimate tensile strength increases from (463.8±1.6) MPa to (552.9±6.5) MPa after aging for 1 h, without causing an obvious loss of ductility. The strength enhancement is attributed mainly to the effective impediment of dislocation motion by L12-Al3 (Sc, Zr) precipitates and stacking fault structures, whereas the retention of ductility is associated with local stress relaxation and improved deformation compatibility induced by microstructural recovery during aging.