喷射成形过共晶<strong>AlSiCuMg</strong>合金的固溶行为

doi:10.11900/0412.1961.2021.00079

金属学报

2022, Vol. 58

Issue (9): 1129-1140 DOI: 10.11900/0412.1961.2021.00079

研究论文

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喷射成形过共晶AlSiCuMg合金的固溶行为

冯迪¹(

), 朱田¹, 臧千昊¹, 李胤樹²^,³, 范曦⁴, 张豪⁴

^1.江苏科技大学材料科学与工程学院镇江 212003
^2.Metallic Materials Division, Korea Institute of Materials Science, Changwon 51508, Korea
^3.Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
^4.江苏豪然喷射成形合金有限公司镇江 212009

Solution Behavior of Spray-Formed Hypereutectic AlSiCuMg Alloy

FENG Di¹(

), ZHU Tian¹, ZANG Qianhao¹, LEE Yunsoo²^,³, FAN Xi⁴, ZHANG Hao⁴

^1.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
^2.Metallic Materials Division, Korea Institute of Materials Science, Changwon 51508, Korea
^3.Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
^4.Jiangsu Haoran Spray Forming Alloy Co., Ltd., Zhenjiang 212009, China

引用本文:

冯迪, 朱田, 臧千昊, 李胤樹, 范曦, 张豪. 喷射成形过共晶AlSiCuMg合金的固溶行为[J]. 金属学报, 2022, 58(9): 1129-1140.
Di FENG, Tian ZHU, Qianhao ZANG, Yunsoo LEE, Xi FAN, Hao ZHANG. Solution Behavior of Spray-Formed Hypereutectic AlSiCuMg Alloy[J]. Acta Metall Sin, 2022, 58(9): 1129-1140.

全文: PDF(4665 KB) HTML

摘要:

利用OM、XRD、SEM + EBSD、TEM、硬度测试以及相图计算研究了喷射成形Al25Si4Cu1Mg (质量分数,%)合金在固溶过程中的第二相和晶粒演变行为。结果表明：喷射成形过共晶AlSi合金的热挤压组织包含等轴状α-Al、微米级先共晶Si、非层片状共晶Si、共晶AlCuSiMg、共晶Al₂Cu相以及低体积分数的富Fe相。α-Al中还包含脱溶析出的微纳米和纳米级Al₂Cu相。Si相和α-Al的晶粒尺寸随固溶温度的升高而连续粗化。在475~495℃温度范围固溶时,脱溶相以及部分共晶Al₂Cu相随固溶温度的升高而回溶,残余Al₂Cu相向富Fe相聚集并粗化,AlCuSiMg相的体积分数和尺寸有所增加。515℃固溶时,第二相回溶程度继续提高,AlCuSiMg相的体积分数开始下降,但未见明显过烧现象。固溶温度超过515℃后,非平衡共晶相的熔化随温度的升高而加剧。过烧组织以晶界处的网状共晶和晶界宽化为主要特征。喷射成形Al25Si4Cu1Mg合金的硬度取决于溶质原子固溶度、残余第二相体积分数、α-Al晶粒尺寸、Si相尺寸以及非平衡共晶相熔化5个相互制约的因素。

关键词 ：喷射成形, 过共晶合金, AlSiCuMg合金, 固溶, 初熔

Abstract：

Al-Si multicomponent alloys are commonly used in automotive and aerospace fields owing to their excellent castability, good wear resistance, and low coefficient of thermal expansion. After adding Cu and Mg followed by appropriate heating, Al₂Cu, AlCuSiMg, or Mg₂Si phases precipitate in an α-Al matrix. Hypereutectic AlSiCuMg alloys have been used in wear-resistant products, such as engine cylinders, pistons, and air-conditioning rotors, owing to the hardening effect of Si particles and the solid solution strengthening and precipitation strengthening effects of Cu and Mg. The evolution behaviors of secondary phases and the grains of the spray-formed Al25Si4Cu1Mg (mass fraction, %) alloy were examined via OM, XRD, SEM + EBSD, TEM, hardness tests, and phase diagram calculations. The results showed that the hot extrusion microstructure of spray-formed hypereutectic AlSi alloys comprises equiaxed α-Al, proeutectic Si, eutectic Si, eutectic AlCuSiMg, a eutectic Al₂Cu phase, and a low volume fraction Fe-bearing phase at the micron level but without a lamellar morphology. α-Al contained both micro-nano and nano-sized Al₂Cu phases precipitates. Over the temperature range of 475-495^oC, the precipitated Al₂Cu phase and some of the eutectic Al₂Cu phase redissolved, and the residual Al₂Cu phase concentrated to a Fe-bearing phase and coarsened. The volume fraction and size of the AlCuSiMg phase increased. However, when solution-treated at less than 515^oC, the volume fraction of the AlCuSiMg phase began to decrease, and no overburning structure was observed. When the solution temperature exceeded 515^oC, the incipient melting of the nonequilibrium eutectic phase increased with increasing solution temperature. The main characteristics of the overburning structure were the network eutectic and grain boundary broadening. The hardness of the spray-formed Al25Si4Cu1Mg alloy was dependent on five factors: the solid solubility of solute atoms, the volume fraction of the residual second phase, the grain size of α-Al, the scale of the Si phase, and the incipient melting of the nonequilibrium eutectic phase.

Key words： spray forming hypereutectic alloy AlSiCuMg alloy solution incipient melting

收稿日期: 2021-02-25

ZTFLH:

TG166.3

基金资助:国家自然科学基金青年基金项目(51801082);江苏省大学生创新创业计划项目(202010289019Z)

作者简介: 冯迪,男,1984年生,副教授,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00079 或 https://www.ams.org.cn/CN/Y2022/V58/I9/1129

图1 喷射成形Al25Si4Cu1Mg合金热挤压态的DSC曲线

图2 Al25Si4Cu1Mg合金的XRD谱

图3 喷射成形Al25Si4Cu1Mg合金微观组织的SEM像

图4 不同固溶温度下喷射成形Al25Si4Cu1Mg合金微观组织的OM像

图5 不同固溶温度下喷射成形Al25Si4Cu1Mg合金微观组织的SEM像

图6 不同固溶工艺下的硬度对比

图7 不同固溶温度下合金微观组织的局部取向差(KAM)及二次电子像

图8 基于FactSage软件绘制的Al25Si4Cu1Mg合金的相图(垂直截面)

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