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流變鑄造AZ91-Sn合金的組織演化、拉伸行為及磨損性能
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1.東北大學(xué) 遼寧省輕量化用關(guān)鍵金屬結(jié)構(gòu)材料重點(diǎn)實(shí)驗(yàn)室，遼寧 沈陽(yáng) 110819;2.東莞宜安科技股份有限公司，廣東 東莞 523662;3.大連交通大學(xué) 連續(xù)擠壓教育部工程研究中心，遼寧 大連 116028

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Microstructure Evolution, Tensile Behavior, and Wear Properties of AZ91 Alloys with Different Sn Contents by Rheocasting
Author:
Affiliation:

1.Key Laboratory of Lightweight Structural Materials Liaoning Province, Northeastern University, Shenyang 110819, China;2.Dongguan Eontec Co., Ltd, Dongguan 523662, China;3.Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian 116028, China

Fund Project:

National Natural Science Foundation of China (51771045, U1764254); Fundamental Research Funds for the Central Universities (N2002016)

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    摘要:

    研究了不同Sn含量流變鑄造AZ91合金的組織演化、拉伸行為及磨損性能。結(jié)果表明：Sn的合金化改變了Al在鎂基體中的固溶度，并且顯著細(xì)化了微觀組織。加入0.8%（質(zhì)量分?jǐn)?shù)，下同）的Sn后，合金平均晶粒尺寸從105.0 μm降至42.1 μm。高熔點(diǎn)的金屬間化合物為析出相提供了異質(zhì)形核點(diǎn)，這些彌散析出的第二相在流變凝固過(guò)程中有效地細(xì)化了鎂基體。彌散分布的第二相抑制了枝晶組織生長(zhǎng)，從而進(jìn)一步提升了合金的力學(xué)性能。隨著Sn含量的增加，合金磨損率顯著降低，磨粒磨損逐漸消失。3.0%Sn合金化的流變鑄造AZ91合金具有最高的抗拉伸強(qiáng)度以及最好的耐磨損性能。

    Abstract:

    The effect of different Sn contents on microstructure evolution, tensile behavior, and wear properties of AZ91 alloys by rheocasting was studied. The results show that the presence of Sn changes the solid solubility of Al in Mg matrix and effectively refines the microstructure of alloy matrix. The average grain size is refined from 105.0 μm to 42.1 μm after addition of 0.8wt% Sn. The heterogeneous precipitate nuclei are formed by the intermetallics with high melting point, which effectively refines the magnesium matrix during the rheo-solidification. These dispersed second phases suppress the formation of dendrites, further improving the mechanical properties. With increasing the Sn content, the wear rate of alloys is obviously decreased and the abrasive wear disappears gradually. The rheocast AZ91 alloy with addition of 3.0wt% Sn has the highest tensile strength and the best wear resistance.

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李衛(wèi)榮,但昀,黃顯祥,管仁國(guó),任浩博,李揚(yáng)德,孫麗娟,張晉,鐵鏑.流變鑄造AZ91-Sn合金的組織演化、拉伸行為及磨損性能[J].稀有金屬材料與工程,2021,50(11):3879~3884.[Li Weirong, Dan Yun, Huang Xianxiang, Guan Renguo, Ren Haobo, Li Yangde, Sun Lijuan, Zhang Jin, Tie Di. Microstructure Evolution, Tensile Behavior, and Wear Properties of AZ91 Alloys with Different Sn Contents by Rheocasting[J]. Rare Metal Materials and Engineering,2021,50(11):3879~3884.]
DOI：10.12442/j. issn.1002-185X.20200667

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  • 收稿日期:2020-09-03
  • 最后修改日期:2020-09-19
  • 錄用日期:2020-10-21
  • 在線發(fā)布日期: 2021-11-25
  • 出版日期: 2021-11-24