Effects of B on Microstructure and Properties of Mg-7Al-0.4Zn-0.2Mn Alloy

Chen Jingyang Guan Shaokang Shi Guangxin Zhang Chunxiang

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Effects of B on Microstructure and Properties of Mg-7Al-0.4Zn-0.2Mn Alloy
Issue 8, Pages: 454-456(2005)
Published： 2005 ，
DOI：

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[1]陈晶阳,关绍康,石广新,张春香.硼对Mg-7Al-0.4Zn-0.2Mn合金组织及性能的影响[J].特种铸造及有色合金,2005(08):454-456+445.

Chen Jingyang Guan Shaokang Shi Guangxin Zhang Chunxiang. Effects of B on Microstructure and Properties of Mg-7Al-0.4Zn-0.2Mn Alloy. [J]. Special Casting & Nonferrous Alloys (8):454-456(2005)
[1]陈晶阳,关绍康,石广新,张春香.硼对Mg-7Al-0.4Zn-0.2Mn合金组织及性能的影响[J].特种铸造及有色合金,2005(08):454-456+445. DOI：

Chen Jingyang Guan Shaokang Shi Guangxin Zhang Chunxiang. Effects of B on Microstructure and Properties of Mg-7Al-0.4Zn-0.2Mn Alloy. [J]. Special Casting & Nonferrous Alloys (8):454-456(2005) DOI：

摘要

研究了B对Mg-7Al-0.4Zn-0.2Mn合金显微组织和力学性能的影响。结果表明:加入微量的B就能使合金的晶粒得到显著的细化

并且随着B加入量的增加

细化效果越明显

当B的加入量（质量分数

下同）为0.15%时

平均晶粒尺寸由未变质合金的约140μm细化到约40μm。分析认为:具有密排六方结构的高熔点化合物AlB2可作为α-Mg的异质核心

从而细化镁合金晶粒。微量B的加入使铸态合金的力学性能得到不同程度的提高

当B的加入量为0.15%时

合金的显微硬度、抗拉强度和屈服强度分别比未变质合金提高13.1%、19.5%和22.0%

冲击吸收功约为未变质合金的2.3倍。B的加入量为0.10%时

合金的伸长率比未变质合金提高21.6%。

Abstract

Effects of B on microstructure and mechanical properties of Mg-7Al-0.4Zn-0.2Mn alloy were investigated.It was found the as-cast microstructure and average grain size are remarkably refined with trace B addition

exhibiting more strongly refining effects with increase of the B content.The average grain size was decreased from about 140μm without B alloy to 40μm with 0.15% B addition.It was concluded that the grain size was refined due to the high melt point compound AlB

with HCP crystal structure serving as the heterogeneous nuclei site.The mechanical properties of the as-cast alloys are increased with trace B addition.The microhardness

tensile strength and yield strength of the alloy with 0.15% B addition were increased by 13.1%

19.5% and 22.0%

respectively

comparing with those of the alloy without B addition

and the energy to fracture is 2.3 times than that of the alloy without B addition.Elongation of the alloy with 0.10% B content is increased by 21.6% comparing with that of as-cast alloy.