Manipulating the powder size to achieve enhanced strength and ductility in harmonic structured Al alloy

Manipulating the powder size to achieve enhanced strength and ductility in harmonic structured Al alloy
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控制粉末尺寸以提高谐波结构铝合金的强度和延展性

DOI:
10.1080/21663831.2019.1580621
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发表时间:
2019-02
影响因子:
8.3
通讯作者:
Ma Chaoli
Ma Chaoli
中科院分区:
材料科学2区
文献类型:
--
作者:
Zheng Ruixiao;Li Guodong;Zhang Zhe;Zhang Yitan;Yue Shengyu;Chen Xu;Ameyama Kei;Ma Chaoli

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本研究报告了一种简单的一步粉末冶金方法,用于生产具有独特谐波结构和优异力学性能的大块细晶Al2024合金。通过改变初始粉末粒度,可以很容易地控制体试样的晶粒尺寸。拉伸试验表明,平均晶粒尺寸为3.78µm(粉末尺寸~ 20µm)的细晶试样的屈服强度约为265 MPa,是常规粗晶试样的3倍,并保持了良好的延展性(总伸长率~ 15%)。讨论了其独特的显微组织和增强的力学性能的原因。采用简单的一步粉末冶金方法,利用气体雾化粉末成功制备了具有独特“谐波结构”和增强力学性能的大块铝合金。
ABSTRACT The present work reports a simple one-step powder metallurgy approach for producing bulk fine-grained Al2024 alloy with a unique harmonic structure and superior mechanical properties. The grain size of the bulk specimen could be easily manipulated by changing the initial powder size. Tensile test suggested that the yield strength of the fine-grained specimen with an average grain size of 3.78 µm (powder size ∼20 µm) was about 265 MPa, which was three times higher than that of the conventional coarse-grained counterpart, maintaining a good ductility (total elongation ∼15%). The reasons for the unique microstructure and the enhanced mechanical properties were discussed. GRAPHICAL ABSTRACT IMPACT STATEMENT Bulk Al alloy with a unique ‘harmonic structure' and enhanced mechanical properties was successfully fabricated by a simple one-step powder metallurgy approach using gas atomized powders.
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