熱處理對超高強鋁合金沉積坯微觀組織的影響

李振亮; 黃海友; 謝建新; 任慧平; 陳偉; 辛海鷹

doi:10.13374/j.issn1001-053x.2010.06.012

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熱處理對超高強鋁合金沉積坯微觀組織的影響

doi: 10.13374/j.issn1001-053x.2010.06.012

1. 北京科技大學材料科學與工程學院, 北京 100083;
2. 內蒙古科技大學材料與冶金學院, 包頭 014010;
3. 中國兵器科學研究院寧波分院, 寧波 315103

基金項目:

內蒙古自然科學基金資助項目(No.20080404MS0801)

詳細信息

作者簡介:
李振亮(1968-),男,博士研究生;謝建新(1958-),男,教授,博士生導師,E-mail:jxxie@mater.ustb.edu.cn

中圖分類號: TG146.2⁺1
計量
- 文章訪問數: 131
- HTML全文瀏覽量: 23
- PDF下載量: 6
- 被引次數: 0
出版歷程
- 收稿日期: 2009-10-19

Effects of heat treatment on the microstructure of as-deposited ultrahigh strength aluminium alloys

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;
3. Ningbo Branch of China Academy of Ordnance Science, Ningbo 315103, China

摘要

摘要: 以噴射沉積技術制備的Al-12Zn-2.4Mg-1.1Cu-0.20Zr-0.30Sc-0.30Ni合金沉積坯為研究對象,采用DSC、XRD、SEM和TEM等分析手段對沉積坯在不同溫度下熱處理后的微觀組織演變進行了研究.結果表明:室溫沉積坯基體中有大量η相粒子;在不同熱處理制度下溶質元素會發生回溶或脫溶,從而影響合金組織與性能;在460℃/8h熱處理時,依附于富Cu初始η相粒子形成了亞穩態T((Al,Zn)₄₉Mg₃₂)相,該相在490℃/8h熱處理后消失;490℃/8h熱處理時Al₃(Sc,Zr)粒子從沉積坯二次析出,其"釘扎效應"與Cu回溶造成的"晶格畸變"是490℃/8h時沉積坯硬度達到最高值(192HV)的重要影響因素.
- 鋁合金 /
- 噴射沉積 /
- 熱處理 /
- 微觀組織
Abstract: Billets of Al-12Zn-2.4Mg-1.1Cu-0.20Zr-0.30Sc-0.30Ni alloys were fabricated by spray deposition (the Osprey process),and the effects of heat treatment at different temperatures on the microstructural evolution were investigated by DSC,XRD,SEM,and TEM.The results show that many η-phase particles disperse in the as-deposited alloy base at room temperature.The re-dissolution and precipitation effect of solute elements occurred at different heating temperatures can affect the microstructure and mechanical properties of the alloys.The metastable T phase ((Al,Zn)₄₉Mg₃₂) forms around η-phase particles with a high Cu content after a heat treatment at 460℃ for 8h,and disappears at 490℃ for 8h.Al₃(Sc,Zr) dispersoids are precipitated at 490℃/8h,the highest hardness (192 HV) of the as-deposited alloys after treatment at 490℃/8h is attributed to the precipitation hardening of Al₃(Sc,Zr) dispersoids and the solution hardening effect caused by Cu.
- aluminium alloys /
- spray deposition /
- heat treatment /
- microstructure