Precipitation Behavior of Sub-rapid Solidified Magnesium Alloy Containing Nano SiC Particle

He Wen; Yin Jiaxin; Wang Xiang; Yang Wei

doi:10.15980/j.tzzz.2018.07.001

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Precipitation Behavior of Sub-rapid Solidified Magnesium Alloy Containing Nano SiC Particle
Vol. 38, Issue 7, Pages: 697-701(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.07.001

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[1]何文,尹家新,王祥,杨伟.纳米SiC参与下亚快速凝固镁合金沉淀相析出行为[J].特种铸造及有色合金,2018,38(07):697-701.

He Wen, Yin Jiaxin, Wang Xiang, et al. Precipitation Behavior of Sub-rapid Solidified Magnesium Alloy Containing Nano SiC Particle. [J]. Special Casting & Nonferrous Alloys 38(7):697-701(2018)
[1]何文,尹家新,王祥,杨伟.纳米SiC参与下亚快速凝固镁合金沉淀相析出行为[J].特种铸造及有色合金,2018,38(07):697-701. DOI： 10.15980/j.tzzz.2018.07.001.

He Wen, Yin Jiaxin, Wang Xiang, et al. Precipitation Behavior of Sub-rapid Solidified Magnesium Alloy Containing Nano SiC Particle. [J]. Special Casting & Nonferrous Alloys 38(7):697-701(2018) DOI： 10.15980/j.tzzz.2018.07.001.

摘要

采用铜模喷铸与等温热处理相结合

研究了加入2%纳米SiC的AZ91合金的亚快速凝固及其时效析出行为

揭示了SiC对快冷镁合金中晶粒细化与沉淀相形成的影响。结果表明

采用铜模激冷和添加SiC可有效促进镁合金晶粒细化

降低溶质偏析

抑制晶界离异共晶β相。经200℃×2h时效

由于SiC提高了快冷合金中的位错密度和晶格畸变能

沉淀相以不连续颗粒状形式沿晶界析出

原始过饱和固溶体中溶质含量下降。当时效时间延长到16h

原子扩散充分

合金中出现不连续析出和连续析出共存模式

其中前者形成垂直于晶界分布的长条状沉淀相

后者在晶粒内部形成无方向性的颗粒或短棒状沉淀相

并导致合金基体硬度显著提高。

Abstract

Using copper-mould spray casting and isothermal heat treatment

sub-rapid solidification and precipitation behavior of AZ91 alloy with 2% nano SiC were investigated to reveal the influences of SiC particle on grain refinement and precipitation.The experimental results show that both the quenching by copper mould and the addition of SiC can promote refinement and reduce solute segregation

which suppress the formation of divorce eutecticβphase in grain boundary.After aging treatment at 200 ℃for 2 h

the SiC particles can increase the dislocation density and lattice distortion energy.Consequently

granular discontinuous precipitates can be formed along the grain boundary

and the solute content of supersaturated solid solution is decreased.With increasing aging time to 16 h

sufficient atomic diffusion can take the coexistence of discontinuous precipitation and continuous precipitation modes

which forms aperpendicular distribution of strip precipitates to the grain boundary and non directional precipitates with granular or short rod inside grain.Moreover

the hardness of primary grain can be increased significantly.