Fracture Analysis of Al Alloy ZL102 Polishing Machine ring

Luo Changsen1; Luo Hong1; Zeng Xianguang1

doi:10.15980/j.tzzz.2013.03.032

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Fracture Analysis of Al Alloy ZL102 Polishing Machine ring
Vol. 33, Issue 3, Pages: 285-288(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.03.032

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[1]罗昌森,罗宏,曾宪光.ZL102铝合金抛光机扣环断裂分析[J].特种铸造及有色合金,2013,33(03):285-288.

Luo Changsen1, Luo Hong1, Zeng Xianguang1. Fracture Analysis of Al Alloy ZL102 Polishing Machine ring. [J]. Special Casting & Nonferrous Alloys 33(3):285-288(2013)
[1]罗昌森,罗宏,曾宪光.ZL102铝合金抛光机扣环断裂分析[J].特种铸造及有色合金,2013,33(03):285-288. DOI： 10.15980/j.tzzz.2013.03.032.

Luo Changsen1, Luo Hong1, Zeng Xianguang1. Fracture Analysis of Al Alloy ZL102 Polishing Machine ring. [J]. Special Casting & Nonferrous Alloys 33(3):285-288(2013) DOI： 10.15980/j.tzzz.2013.03.032.

摘要

应用扫描电镜、金相显微镜等对ZL102合金抛光机扣环的断裂进行了断口观察和显微组织分析。结果表明

扣环试样显微组织是由α-Al相、粗大针状的共晶Si相、块状的初生Si相以及少量的骨架状T1（Al7Fe2Si2）和细针状T2（Al5FeSi）富Fe相组成。合金断口表面有许多位向不同的解理刻面

其中的裂纹以穿晶方式解理断裂且存在舌状花样、解理台阶等脆性断裂特征。过多的脆性富Fe相、铸造疏松、夹杂物等削弱了扣环的晶界结合力

导致合金脆性断裂。

Abstract

Fracture morphology and microstructure of ZL102 alloy polishing machine buckle was observed and analyzed by scanning electron microscopy（SEM） and metallurgical microscope.The results show that microstructure of the ring sample is composed of α-Al phase

coarse acicular eutectic Si phase and blocky primary Si phase as well as a small amount of skeleton-like shape the T1（Al7Fe2Si2） and the fine needle-T2（Al5FeSi） iron-rich phase.Different cleavage facets with different orientation can be observed in alloy fracture surface

and the crack occurs as a result of transgranular cleavage fracture

which is characterized by ray florets and cleavage steps.The excessive brittle iron-rich phase

casting porosity and inclusions can weaken the binding force of the grain boundary

leading to brittle fracture of alloy.