Microstructure of Al-5Zr-xB Refiner and Its Grain Refining Efficiency on AZ91D Magnesium Alloy

doi:10.15980/j.tzzz.2015.10.003

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Microstructure of Al-5Zr-xB Refiner and Its Grain Refining Efficiency on AZ91D Magnesium Alloy
Vol. 35, Issue 10, Pages: 1016-1020(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.10.003

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[1]王顺成,宋东福,黄正华,戚文军,郑开宏.Al-5Zr-xB细化剂组织及对AZ91D合金的细化作用[J].特种铸造及有色合金,2015,35(10):1016-1020.

Microstructure of Al-5Zr-xB Refiner and Its Grain Refining Efficiency on AZ91D Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 35(10):1016-1020(2015)
[1]王顺成,宋东福,黄正华,戚文军,郑开宏.Al-5Zr-xB细化剂组织及对AZ91D合金的细化作用[J].特种铸造及有色合金,2015,35(10):1016-1020. DOI： 10.15980/j.tzzz.2015.10.003.

Microstructure of Al-5Zr-xB Refiner and Its Grain Refining Efficiency on AZ91D Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 35(10):1016-1020(2015) DOI： 10.15980/j.tzzz.2015.10.003.

摘要

采用KBF4和K2ZrF4混合粉末与铝熔体反应制备镁合金用Al-5Zr-xB细化剂

利用光学显微镜、X射线衍射仪和扫描电镜

研究了Al-5Zr-xB镁合金细化剂的显微组织及其对AZ91D镁合金的晶粒细化作用。结果表明

Al-5Zr-xB细化剂中含有大量细小均匀的ZrB2粒子

ZrB2粒子团聚分布在α-Al晶界上。细化剂中的B含量越高

ZrB2粒子的数量越多

晶粒细化能力越强。添加0.2%的Al-5Zr-1.8B细化剂

可使AZ91D镁合金中的α-Mg晶粒细化至120μm

抗拉强度和伸长率分别提高至213 MPa和4.95%

与未添加Al-5Zr-1.8B细化剂相比

AZ91D镁合金的晶粒平均直径下降了63.4%

抗拉强度和伸长率分别提高了15.1%和30.3%。

Abstract

The Al-5Zr-xB grain refiner was prepared by in-situ reaction from Al melt and K2ZrF4+KBF4powders.The microstructure and grain refining efficiency of Al-5Zr-xB grain refiner were analyzed by OM（optical microscopy）

XRD（X-ray diffraction）and SEM（scanning electron microscopy）.The results show that the Al-5Zr-xB grain refiner is composed of a lot of fine and uniform ZrB2 particles

and the ZrB2 particles are distributed in theα-Al grains boundary in Al-5Zr-xB grain refiner.The higher the content of element B in the Al-5Zr-xB grain refiner is

the more the number of ZrB2 particles are and the stronger the grain refining efficiency of the Al-5Zr-xB grain refiner is.With adding 0.2% Al-5Zr-1.8B grain refiner

the average diameter of theα-Mg grains in AZ91 D magnesium alloy can be refined to 120μm and theα-Mg grains size is decreased by 63.4%.The tensile strength and elongation of AZ91 Dmagnesium alloy are improved to 213 MPa and 4.95%

respectively

which are improved by 15.1% and by30.3% compared with those of AZ91 D magnesium alloy without adding the Al-5Zr-1.8Bgrain refiner