首页|超声处理对Mg-9Al-1Si合金第二相形貌及力学性能的影响

超声处理对Mg-9Al-1Si合金第二相形貌及力学性能的影响

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利用铜质金属型重力铸造制备了 Mg-9Al-1Si合金,通过凝固前施加不同时间超声处理调控合金组织形貌.利用OM、XRD、SEM、拉伸实验等方法研究了在不同超声处理时间作用下Mg-9Al-1Si合金组织形貌演变及其对力学性能的影响.结果表明:未经超声处理时,α-Mg基体呈粗大的树枝晶,粗大汉字状Mg2Si相有明显的团聚现象,β-Mgi7Al12相以断续网状沿枝晶界分布;超声处理能显著细化合金微观组织,α-Mg基体晶粒尺寸减小由粗大的树枝状转变为团絮状,汉字状Mg2Si相被细化,变为长条状或细线状,分布变得均匀;β-Mg17Al12相网状趋势弱化,边界处出现大量层片状β-Mg17 A112相.随着超声时间增加,超声的声空化和声流作用使合金组织明显改善,但作用时间太长反而减弱组织细化作用.因此,超声处理后Mg-9Al-1Si合金力学性能得到明显改善,且随超声作用时间先增后降,其中超声处理20 min时提升最大,相较于未超声处理合金分别提高了 72、74 MPa和 2.31％.
Effect of Ultrasonic Treatment on Second Phase Morphology and Mechanical Properties of Mg-9Al-1Si Alloy
Mg-9Al-1Si alloy was prepared by gravity casting of copper metal mold,and the microstructure of the alloy was controlled by ultrasonic treatment at different time before solidification.The evolution of microstructure and morphology and its effect on mechanical properties of Mg-9Al-1Si alloy under different ultrasonic treatment time were characterized by means of OM,XRD,SEM and tensile test.The results show that without ultras-onic treatment,α-Mg matrix is coarse dendrite,coarse Chinese character-like Mg2Si phase has obvious agglomeration,β-Mg17 Al12phase is intermittently reticulated along the dendrite boundary,ultrasonic treatment can significantly refine the microstructure of the alloy,the grain size of α-Mg matrix changes from coarse dendritic to flocculent,and the Chinese character Mg2 Si phase is refined into strip or thin line,and the distribution becomes uniform.The reticular trend of β-Mg17 Al12 phase weakens,and a large number of lamellar β-Mg17Al1 2 phases appear at the boundary.With the increase of ultrasonic time,the effect of ultrasonic cavitation and sound flow can obviously improve the microstructure of the alloy,but the effect of ultrasonic cavitation and acoustic flow on microstructure refinement is weakened for too long.Therefore,the mechanical properties of Mg-9Al-1Si alloy were significantly improved after ultrasonic treatment,and increased at first and then decreased with ultrasonic treatment time,in which the improvement of ultrasonic treatment of 20 min was the highest,which was 72,74 MPa and 2.31％high er than that of untreated alloy,respectively.

ultrasonic treatmentMg-9Al-1SiMg2Siβ-Mg17Al12microstructuremechanical properties

任广笑、赵占军、曹喜娟、王红霞、赵庆、刘良智、牛晓峰

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山西江淮重工有限责任公司,山西省轻金属及其复合材料研发及结构化应用中试基地,山西晋城 048000

太原理工大学材料科学与工程学院,先进镁基材料山西省重点实验室,太原 030024

超声处理 Mg-9Al-1Si Mg2Si β-Mg17Al12 显微组织 力学性能

山西省科技成果转化引导专项山西省科技成果转化引导专项山西省自然科学基金项目山西省自然科学基金项目中央引导地方科技发展资金项目国家自然科学基金面上项目

2021040213010222022040213010092021030212313520210302123163YDZJSX20231B00352474419

2024

10.3969/j.issn.2095-1744.2024.10.006

有色金属工程
北京矿冶研究总院

有色金属工程

CSTPCD北大核心
影响因子：0.432
ISSN：2095-1744
年,卷(期)：2024.14(10)