Wear Behavior and Its Mechanism of 7075 Aluminum Alloy

Ge Lingdan1; Wang Shuqi1; Yang Zirun2

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Wear Behavior and Its Mechanism of 7075 Aluminum Alloy
Vol. 31, Issue 2, Pages: 178-182(2011)
Published： 2011 ，
DOI：

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[1]葛灵丹,王树奇,杨子润.7075铝合金的磨损行为及其机理探讨[J].特种铸造及有色合金,2011,31(02):178-182+205.

Ge Lingdan1, Wang Shuqi1, Yang Zirun2. Wear Behavior and Its Mechanism of 7075 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 31(2):178-182(2011)
[1]葛灵丹,王树奇,杨子润.7075铝合金的磨损行为及其机理探讨[J].特种铸造及有色合金,2011,31(02):178-182+205. DOI：

Ge Lingdan1, Wang Shuqi1, Yang Zirun2. Wear Behavior and Its Mechanism of 7075 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 31(2):178-182(2011) DOI：

摘要

在干摩擦条件下

以外加载荷和环境温度为变量

对7075铝合金的磨损行为进行研究。结果表明

7075铝合金随着载荷增加

出现从轻微磨损到严重磨损的转变

并且随温度的升高磨损转变的临界载荷大大减小。7075铝合金在常温～150℃下的磨损率明显小于200℃以上的磨损率。轻微磨损时

以磨粒磨损和氧化剥层磨损为主;严重磨损时

以热软化、粘着磨损及疲劳剥落为主。7075铝合金的磨损与其表面生成的机械混合层（MML）密切相关。当MML不被完全破坏时

其磨损率很低;一旦MML消失

就转变为严重磨损。

Abstract

Wear behavior of 7075 aluminum alloy with different loadings and temperatures was investigated in condition of dry sliding friction.The results reveal that with increasing in loading

a mild to severe wear transformation occurs

and with increasing in temperature

critical loading is greatly decreased.The wear weight loss of the alloy at 20

50 ℃ is obvious lower than that at more than 200 ℃.The wear mechanism is characterized by oxidation wear and abrasive wear in mild wear

while it is characterized by thermal softening

adhesive wear and delamination wear in severe wear.Wear behavior of the alloy is strongly dependent on the mechanical mixed layer（MML）formed on worn surface.As long as the MML exists

the wear rate is very low

while it disappears

severe wear is prevailed.