Tensile Fracture Morphology of As-cast 7005 Aluminum Alloy Produced by Electrolytic Liquid Al

Wu Wenxiang; Deng Zhenzhen; Chen Qi; Ma Ke; Wang Jiachun

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Tensile Fracture Morphology of As-cast 7005 Aluminum Alloy Produced by Electrolytic Liquid Al
Vol. 29, Issue 11, Pages: 1061-1063(2009)
Published： 2009 ，
DOI：

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[1]吴文祥,邓桢桢,陈琦,马科,王家淳.电解铝液制备的7005铝合金铸态拉伸断口分析[J].特种铸造及有色合金,2009,29(11):1061-1063+979.

Wu Wenxiang, Deng Zhenzhen, Chen Qi, et al. Tensile Fracture Morphology of As-cast 7005 Aluminum Alloy Produced by Electrolytic Liquid Al. [J]. Special Casting & Nonferrous Alloys 29(11):1061-1063(2009)
[1]吴文祥,邓桢桢,陈琦,马科,王家淳.电解铝液制备的7005铝合金铸态拉伸断口分析[J].特种铸造及有色合金,2009,29(11):1061-1063+979. DOI：

Wu Wenxiang, Deng Zhenzhen, Chen Qi, et al. Tensile Fracture Morphology of As-cast 7005 Aluminum Alloy Produced by Electrolytic Liquid Al. [J]. Special Casting & Nonferrous Alloys 29(11):1061-1063(2009) DOI：

摘要

通过室温拉伸试验研究了电解铝液制备的7005合金铸态力学性能

并采用光学显微镜观察、扫描电镜观察及能谱分析等手段对拉伸断口及其纵截面的组织形貌进行分析。结果表明

电解铝液中的Fe、Si、H2、Al2O3夹杂对7005合金铸态力学性能有显著影响。铝电解过程中生成的H2和Al2O3夹杂

是铸锭中形成疏松、夹杂的原因。电解铝液中的Fe、Si杂质元素与合金中的Mn、Mg等元素作用形成硬脆、粗大的AlFeMnSi、Mg2Si等第二相

分布于晶内以及晶界处。试样的断裂主要是由夹杂物、疏松孔洞及AlFeMnSi脆性相等裂纹源的综合作用而引起的

拉伸断裂的模式为穿晶方式的韧窝-准解理混合型断裂。

Abstract

Tensile strength of as-cast 7005 aluminum alloy produced by electrolytic liquid Al was measured by means of room temperature tensile testing.Fracture morphology and longitudinal microstructure were observed by OM（optical microscope） and SEM（scanning electron microscope） as well as EPA（energy spectrum analysis）.The results indicate that tensile strength of as-cast 7005 alloy is distinctly dependent on the Fe

H and Al2O3 inclusions in electrolytic liquid Al.Shrinkage porosity and inclusions in aluminum ingot are controlled by creation of H2 and Al2O3 inclusions in electrolytic liquid Al.The hard brittle coarse second phase

such as AlFeMnSi

Mg2Si phase

are formed by the reaction of impurity elements Fe

Si in electrolytic liquid Al with alloy elements Mn

which is distributed in grains and on the grain boundaries.The fracture of the samples is attributed to the co-action of inclusions

shrinkage porosity and brittle AlFeMnSi phases.Tensile fracture mechanism of as-cast 7005 aluminum alloy is characterized by dimple-quasi-cleavage features of trangranular model.