8(MnFe)2Si和α-Al8(MnFeCr)2Si相存在。采用水冷銅模鑄造的含Mn和Zr的6061鋁合金,其拉伸性能得到明顯改善。經(jīng)均勻化處理后其抗拉強(qiáng)度達(dá)到286MPa、屈服強(qiáng)度127MPa,延伸率17.84%。"/>

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水冷銅模對(duì)添加Mn和Zr的6061鋁合金微觀組織及力學(xué)性能的影響
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東北大學(xué)

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國家自然科學(xué)基金資助(No.51301109)


Effects of Water-Cooling Cu Mould on Microstructure and Mechanical Properties of 6061 Aluminum Alloy with Mn and Zr Addition
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Northeastern University

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    研究了水冷銅模鑄造對(duì)添加Mn和Zr元素的6061鋁合金的微觀組織及力學(xué)性能的影響。利用金相顯微鏡、掃描電鏡和EDS能譜,分析合金的微觀組織；結(jié)合X射線衍射分析及Vegard定律,估算鑄態(tài)及均勻化處理后Mg,Si和Mn元素在合金中的固溶度；通過拉伸實(shí)驗(yàn)測(cè)試含Mn和Zr 的6061鋁合金力學(xué)性能。結(jié)果表明：水冷銅模亞快速凝固鑄造降低了溶質(zhì)元素Mg、Si、Mn在鑄態(tài)合金中的偏析,減少了合金的均勻化處理時(shí)間；Mn和Zr元素的添加,使晶粒細(xì)化明顯；水冷銅模使鑄態(tài)析出相由骨骼狀和條狀的β鐵相轉(zhuǎn)變?yōu)轭w粒狀的α鐵相,均勻化處理后主要以顆粒狀的α-Al8(MnFe)2Si和α-Al8(MnFeCr)2Si相存在。采用水冷銅模鑄造的含Mn和Zr的6061鋁合金,其拉伸性能得到明顯改善。經(jīng)均勻化處理后其抗拉強(qiáng)度達(dá)到286MPa、屈服強(qiáng)度127MPa,延伸率17.84%。

    Abstract:

    Effects of sub-rapid solidification by water-cooling Cu mould on microstructure and mechanical properties of 6061 aluminum alloy with Mn and Zr addition were investigated. Microstructure of the alloys was analyzed by optical microscopy, scanning electron microscopy and EDS energy spectrum. Solubilities of Mg, Si and Mn elements in as-cast and homogenized Al alloys were estimated by X-ray diffraction and Vegard’s Law. Tensile tests were conducted to investigate the mechanical properties of 6061 aluminum alloy. Results showed that both the segregation of Mg, Si and Mn elements and homogenization time were decreased by sub-rapid solidification. The grain size had also been refined significantly by adding Mn and Zr elements. As-cast precipitated phase was transformed into α-Fe phase of granulate from β-Fe of bone and strip by water-cooling Cu mould., and they were maily granular α-Al8(MnFe)2Si和α-Al8(MnFeCr)2Si after homogenization treatment. Tensile properties of Al alloy with Mn and Zr addition casted by water-cooling Cu mould. The UTS, YS and Elongation of homogenized alloy researches to 286Mpa, 27Mpa and 17.84%, respectively.

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申華,史建超,穆永亮,羅洪杰,姚廣春.水冷銅模對(duì)添加Mn和Zr的6061鋁合金微觀組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2019,48(1):300~308.[Shen Hua, Shi Jianchao, Mu Yongliang, Luo Hongjie, Yao Guangchun. Effects of Water-Cooling Cu Mould on Microstructure and Mechanical Properties of 6061 Aluminum Alloy with Mn and Zr Addition[J]. Rare Metal Materials and Engineering,2019,48(1):300~308.]
DOI：10.12442/j. issn.1002-185X.20170429

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  • 收稿日期:2017-05-24
  • 最后修改日期:2017-10-13
  • 錄用日期:2017-11-09
  • 在線發(fā)布日期: 2019-02-18
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