7A36铝合金挤压板材的TTT曲线与淬火析出行为
TTT diagrams and quenching precipitation behavior of 7A36 aluminum alloy extruded plate
查看参考文献33篇
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文摘
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采用分级淬火实验获得7A36铝合金挤压板材的时间-温度-转变(TTT)曲线,通过计算相图结合光学显微镜、扫描电镜、透射电镜、扫描透射电镜和高分辨透射电镜等分析手段研究淬火析出行为。结果表明:抑制合金相转变0.5%的临界淬火速率约为15.7 ℃/s,10%TTT曲线的鼻尖温度约为338 ℃,鼻尖处的转变时间约为22 s。在不同等温保温样品中观察到η(MgZn_2)相、T(Al_2Zn_3Mg_3)相、S(Al_2CuMg)相和富Cu-Zn的Y相等淬火析出相,并将其析出行为描述在TTT曲线中,绘制成时间-温度-析出相图。η平衡相依次在晶界、亚晶界和弥散粒子上形核长大,等温保温的温度越高,η相的尺寸越大。电导率随保温温度的升高先增大后减小;在420 ℃等温保温时,电导率升高是由于η相和T相的析出引起,在330 ℃和240 ℃等温保温时,电导率升高是由于η相、T相、S相和Y相析出的共同作用。 |
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其他语种文摘
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The time-temperature-transformation (TTT) diagrams of 7A36 aluminum alloy extruded plate were determined by an interrupted-quench method. The quenching precipitation behavior was investigated by calculate phase diagram(CALPHAD) combined with optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),scanning transmission electron microscopy (STEM) and high-resolution transmission electron microscopy(HRTEM). The results show that the critical quenching rate for inhibiting the phase transition of 7A36 aluminum alloy by 0.5% is about 15.7 ℃/s. Based on 10%TTT diagram, the nose temperature is determined to be about 338 ℃ with the transformation time of about 22 s. The precipitation of η(MgZn_2),T(Al_2Zn_3Mg_3),S(Al_2CuMg) or Cu-Zn rich Y phases can be found depending on different isothermal holding temperatures and time, and the precipitation behavior is described in the TTT curve, which is described as a time-temperatureprecipitation diagram. η equilibrium phase tends to occur at grain boundary(GB) first and then at sub-grain boundary(SGB) and on dispersoids in the interior of grains, at higher isothermal holding temperature, the size of η phase is larger. The electrical conductivity increases first and then decreases with the increase of holding temperature; isothermal holding at 420 ℃,the increase of electrical conductivity is caused by precipitation of η phase and T phase, while at 330 ℃ and 240 ℃,the increase of electrical conductivity is due to the precipitation of η phase, T phase, S phase and Y phase. |
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来源
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材料工程
,2023,51(11):134-143 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000803
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关键词
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7A36铝合金
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时间-温度-转变曲线
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淬火敏感性
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淬火析出相
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地址
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1.
包头职业技术学院, 内蒙古, 包头, 014030
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中南大学材料科学与工程学院-包头职业技术学院产学研用创新中心, 内蒙古, 包头, 014030
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中南大学材料科学与工程学院, 长沙, 410083
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中南大学, 有色金属材料科学与工程教育部重点实验室, 长沙, 410083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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内蒙古高等学校科研项目
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包头职业技术学院院立科学研究项目
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国家重点研发计划资助项目
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文献收藏号
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CSCD:7604360
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