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金属学报  2017, Vol. 53 Issue (8): 897-906    DOI: 10.11900/0412.1961.2016.00559
  本期目录 | 过刊浏览 |
AA 7055铝合金时效析出过程的小角度X射线散射定量表征
陈军洲1,2(), 吕良星3, 甄良3, 戴圣龙1,2
1 北京航空材料研究院铝合金研究所 北京 100095
2 北京市先进铝合金材料及应用工程技术研究中心 北京 100095
3 哈尔滨工业大学材料科学与工程学院 哈尔滨 150001
Quantitative Characterization on the Precipitation of AA 7055 Aluminum Alloy by SAXS
Junzhou CHEN1,2(), Liangxing LV3, Liang ZHEN3, Shenglong DAI1,2
1 Institute of Aluminum Alloy, Beijing Institute of Aeronautical Materials, Beijing 100095, China
2 Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China
3 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
引用本文:

陈军洲, 吕良星, 甄良, 戴圣龙. AA 7055铝合金时效析出过程的小角度X射线散射定量表征[J]. 金属学报, 2017, 53(8): 897-906.
Junzhou CHEN, Liangxing LV, Liang ZHEN, Shenglong DAI. Quantitative Characterization on the Precipitation of AA 7055 Aluminum Alloy by SAXS[J]. Acta Metall Sin, 2017, 53(8): 897-906.

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摘要: 

利用小角度X射线散射(SAXS)技术系统、定量地研究了AA 7055铝合金在120和160 ℃时效过程中析出相的演变规律。结果表明,在120 ℃时效时,随时效时间延长析出相半径不断增加,时效5 h后半径基本稳定,约为3.3 nm,且尺寸分布基本不变;析出相的体积分数随着时效时间的延长不断增加,由时效5 h时的2.4%增加到时效60 h时的5.2%。在160 ℃时效时,随时效时间延长析出相半径不断增加,由时效0.5 h时的3.1 nm增加到时效72 h时的11.7 nm,尺寸分布范围也随着时效时间的延长而逐渐增加;析出相的体积分数随着时效时间的延长先不断增加,由时效0.5 h时的1.4%增加到时效16 h时的5.4%,时效16 h后趋于平衡。在120和160 ℃时效时,析出相均属于轴比介于0.2~0.3之间的扁椭球状,即为盘状。
关键词 ： AA 7055铝合金,  时效析出,  小角度X射线散射,  定量表征    
Abstract：

AA 7055 aluminum alloy is a newly advanced Al-Zn-Mg-Cu alloy. It has been wide applied in aviation and aerospace field due to its attractive combined properties, such as high strength, high fracture toughness, good resistance to the growth of fatigue cracks and good stress corrosion resistance, and so on. It is generally believed that the optimum ageing precipitates are responsible for these good properties. However, the detailed information, such as size and its distribution, volume fraction, and morphology of precipitate in this alloy is still not clear. Although TEM is used to determine these information, the results are mostly qualitative. Small angle X-ray scattering (SAXS) provides a direct technique to determine the size, morphology and volume fraction of nano-scale particles and the sampling size is much larger than that in TEM. In this work, the evolution of the precipitates during ageing at 120 and 160 ℃ in AA 7055 aluminum alloy were investigated systematically and quantitatively by SAXS technique. The results show that, when ageing at 120 ℃, the average radius of the precipitates increases with increasing the ageing time. After ageing for 5 h and later, the average radius of the precipitates is 3.3 nm, and its distribution almost keeps stably. The volume fraction of the precipitates is also increased with increasing the ageing time. When ageing from 5 h to 60 h, the volume fraction increases from 2.4% to 5.2%. When ageing at 160 ℃, however, the average radius of the precipitates increases from 3.1 nm to 11.7 nm with increasing the ageing time from 0.5 h to 72 h. The volume fraction of the precipitates increases from 1.4% to 5.4% with increasing the ageing time from 0.5 h to 16 h. After ageing for 16 h and later, the volume fraction of the precipitates keeps stably. Both ageing at 120 and 160 ℃, the morphology of the precipitates is similar to a flat ellipsoid with an axis ratio between 0.2 and 0.3. Based on these quantitative results of the precipitates, the strength models during ageing will be built possibility.
Key words： AA 7055 aluminum alloy    ageing precipitation    SAXS    quantitative characterization
收稿日期: 2016-12-13     
ZTFLH:  TG146.2  
作者简介:

作者简介 陈军洲,男,1980年生,高级工程师,博士
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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00559      或      https://www.ams.org.cn/CN/Y2017/V53/I8/897

图1  AA 7055铝合金时效不同时间后的SAXS曲线
图2  AA 7055铝合金120 ℃时效不同时间后在小角区域的Guinier曲线
图3  AA 7055铝合金160 ℃时效不同时间后在小角区域的Guinier曲线
图4  AA 7055铝合金不同温度时效不同时间后析出相的回转半径RG
图5  不同轴比时椭球体理论散射曲线
图6  AA 7055铝合金120 ℃时效不同时间后不同轴比析出相粒子的理论散射曲线和实验曲线对比
图7  AA 7055铝合金160 ℃时效不同时间后不同轴比析出相粒子的理论散射曲线和实验曲线对比
图8  AA 7055铝合金不同温度时效不同时间后析出相的半径R
图9  AA 7055 铝合金120 ℃时效不同时间的Porod曲线以及分段散射曲线
t / h Kp / 10-5 Qh / 10-5 RP μ σ2
5 2.05 3.32 1.55 0.89 2.57
9 3.29 5.03 1.46 0.84 2.56
12 3.32 5.52 1.59 0.91 2.57
16 3.94 6.29 1.52 0.88 2.56
24 3.93 6.52 1.58 0.91 2.58
40 4.23 6.89 1.56 0.95 2.43
48 4.00 6.65 1.59 0.94 2.50
60 4.43 7.21 1.55 0.89 2.56
表1  AA 7055铝合金120 ℃时效不同时间后与析出相尺寸分布有关的参数
图10  AA 7055 铝合金120 ℃时效不同时间的析出相半径对数正态分布p(R)
图11  AA 7055 铝合金160 ℃时效不同时间的Porod曲线以及分段散射曲线
图12  AA 7055 铝合金160 ℃时效不同时间的析出相半径对数正态分布p(R)
t / h Kp / 10-5 Qh / 10-5 RP μ σ2
0.5 1.54 1.94 1.20 0.61 2.83
5 2.05 4.00 1.75 0.97 2.64
7 2.18 5.21 2.28 1.35 2.50
12 2.20 6.12 2.66 1.54 2.56
16 2.56 7.40 2.76 1.56 2.60
24 2.29 7.50 3.13 1.73 2.65
48 1.53 6.88 4.28 2.38 2.64
60 1.48 7.52 4.86 2.73 2.62
表2  AA7055铝合金160 ℃时效不同时间后与析出相尺寸分布有关的参数
图13  AA 7055铝合金时效过程中析出相体积分数的变化规律
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