發(fā)布時間：2018-05-21 15:44

  本文選題：AZ31鎂合金 + 加工硬化　； 參考：《武漢科技大學(xué)》2015年碩士論文

【摘要】：鎂合金具有密排六方晶體結(jié)構(gòu)，滑移系少，室溫塑性變形能力差，因此要提高鎂合金的塑性，需要深入研究鎂合金塑性變形的機理，而加工硬化是鎂合金塑性變形的基礎(chǔ)問題。本文系統(tǒng)研究了擠壓態(tài)AZ31鎂合金在拉伸和壓縮變形過程中的加工硬化規(guī)律及產(chǎn)生加工硬化的原因。通過拉伸與壓縮試驗，研究了AZ31鎂合金應(yīng)力-應(yīng)變曲線及加工硬化率曲線。測量了鎂合金變形前后的織構(gòu)，表明擠壓態(tài)鎂合金具有典型的0002基面織構(gòu)，沿擠壓方向壓縮時，基面發(fā)生了轉(zhuǎn)動，并產(chǎn)生了1012拉伸孿晶，，解釋了鎂合金不同方向壓縮引起力學(xué)各向異性的現(xiàn)象。本文重點研究了第Ⅱ階段加工硬化產(chǎn)生的條件及機理，結(jié)果表明：低溫、高應(yīng)變速率變形時，容易出現(xiàn)第Ⅱ階段加工硬化。根據(jù)流變應(yīng)力位錯模型對第Ⅱ階段形成原因進行了深入分析。本文深入研究了AZ31鎂合金第Ⅲ階段加工硬化規(guī)律，結(jié)果表明：第Ⅲ階段加工硬化服從Voce定律，即加工硬化率與應(yīng)力呈線性關(guān)系，根據(jù)實驗結(jié)果得到了Voce定律的具體表達式。
[Abstract]:Magnesium alloy has dense hexagonal crystal structure, less slip system and poor plastic deformation ability at room temperature. Therefore, in order to improve the plasticity of magnesium alloy, it is necessary to study the mechanism of plastic deformation of magnesium alloy in depth, and work hardening is the basic problem of plastic deformation of magnesium alloy. In this paper, the rule of work hardening of extruded AZ31 magnesium alloy during tensile and compression deformation and the causes of work hardening are systematically studied. The stress-strain curve and work hardening rate curve of AZ31 magnesium alloy were studied by tensile and compression tests. The texture of the extruded magnesium alloy before and after deformation is measured. It is shown that the extruded magnesium alloy has a typical 0002 basal surface texture, which rotates along the extrusion direction and produces 1012 tensile twins. The mechanical anisotropy of magnesium alloys induced by compression in different directions is explained. In this paper, the conditions and mechanism of work hardening in the second stage are studied. The results show that at low temperature and high strain rate deformation, the work hardening in the second stage is easy to occur. Based on the rheological stress dislocation model, the causes of the formation of the second stage were analyzed. In this paper, the work hardening law of AZ31 magnesium alloy in the third stage is studied. The results show that the work hardening wear in the third stage is based on the Voce law, that is, the linear relationship between the work hardening rate and the stress. According to the experimental results, the concrete expression of the Voce law is obtained.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG146.22

【參考文獻】

相關(guān)期刊論文 前10條

1 陳振華;楊春花;黃長清;夏偉軍;嚴(yán)紅革;;鎂合金塑性變形中孿生的研究[J];材料導(dǎo)報;2006年08期

2 黃光杰;錢寶華;汪凌云;J.J.Jonas;;AZ31鎂合金初始動態(tài)再結(jié)晶的臨界條件研究[J];稀有金屬材料與工程;2007年12期

3 歐陽德來;魯世強;崔霞;董顯娟;吳超;邱偉;;應(yīng)用加工硬化率研究TA15鈦合金β區(qū)變形的動態(tài)再結(jié)晶臨界條件[J];航空材料學(xué)報;2010年02期

4 屈偉平;高崧;;鎂合金的特點及應(yīng)用現(xiàn)狀[J];金屬世界;2011年02期

5 李蕭;楊平;孟利;崔鳳娥;;AZ31鎂合金中拉伸孿晶靜態(tài)再結(jié)晶的分析[J];金屬學(xué)報;2010年02期

6 鐘皓,劉培英,周鐵濤;鎂及鎂合金在航空航天中的應(yīng)用及前景[J];航空工程與維修;2002年04期

7 張會;;鎂合金塑性變形機制概述[J];機械管理開發(fā);2013年01期

8 劉靜安;;鎂及鎂合金的特性與擠壓工藝特點[J];輕合金加工技術(shù);2011年05期

9 郭學(xué)鋒;楊文朋;任f ;延雙鶴;;鎂合金的塑性變形與強化機理[J];熱加工工藝;2012年24期

10 楊媛;李加強;宋宏寶;劉鵬成;;鎂合金的應(yīng)用及其成形技術(shù)研究現(xiàn)狀[J];熱加工工藝;2013年08期

本文編號：1919807