首页|LPBF成型加Ti铝基合金的组织特性及其对纳米硬度的影响

LPBF成型加Ti铝基合金的组织特性及其对纳米硬度的影响

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论述了在激光粉末床熔融(LPBF)成型Al基合金中添加Ti的影响.采用扫描电镜、电子背散射衍射、X射线衍射、透射电镜和纳米压痕测试等方法,研究了 Ti含量为3%(质量分数,下同)和不含Ti的LPBF制备样品的显微组织特征、相分布和纳米硬度.结果表明,该方法可获得较细的晶粒组织和较小的平均晶粒尺寸.由于Al3Ti析出相的非均相形核,晶粒尺寸范围减小到2.5μm以内.随着小角度晶界的增大,晶格畸变能增大,平均纳米硬度和杨氏模量分别提高到2.36和92.72 GPa.添加3%Ti后,LPBF处理的Al基合金<100>织构略有增强,但仍有一个随机的晶体取向.获得了a-Al向Al3Ti的相变.
Microstructure Characteristic and Its Impact on Nano-hardness of LPBF-Processed Al-based Alloy with Ti Addition
The influence of Ti addition into Al-based alloy fabricated by laser powder bed fusion(LPBF)technique was demonstrated.The microstructure characteristics,phase identification and nano-hardness of the LPBF-processed samples without or with 3wt%Ti addition were investigated by scanning electron microscope,electron backscatter diffraction,X-ray diffraction,transmission electron microscope and nano-indentation tests.The results reveal that a refined grain microstructure and lower average grain sizes can be obtained.Due to the heterogeneous nucleation provided by Al3Ti precipitated phases,the ranges of grain sizes are reduced within 2.5μm.As the low angle grain boundary increases,higher crystal lattice distortion energy contributes to the increase in average nano-hardness(to 2.36 GPa)and Young's modulus(to 92.72 GPa)values.The<100>texture of LPBF-processed Al-based alloy with 3wt%Ti addition is slightly enhanced,while there is still a random crystal orientation.The phase transformation from a-Al to Al3Ti can be obtained.

laser powder bed fusionmicrostructureprecipitated phasenano-hardnessgrain size

王秋平、关杰仁

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江苏科技大学海洋装备研究院,江苏镇江 212003

激光粉床熔融 组织 析出相 纳米硬度 晶粒尺寸

Natural Science Foundation for Colleges and Universities of Jiangsu ProvinceYouth Science and Technology Innovation Project of Jiangsu University of Science and Technology

22KJB4300231172922101

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(3)
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