發(fā)布時(shí)間：2018-01-09 03:15

  本文關(guān)鍵詞：Al、Ca添加對(duì)Mg-Al-Ca-Mn合金組織和力學(xué)性能的影響　出處：《重慶大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： Mg-Al-Ca-Mn 熱擠壓 微觀組織 力學(xué)性能

【摘要】：研究開發(fā)具有優(yōu)異性能且廉價(jià)的耐熱鎂合金,使其在高溫條件下能滿足汽車傳動(dòng)系統(tǒng)零部件的應(yīng)用,已成為亟待解決的重要課題,而含有Ca的Mg-Al系合金能很好的適應(yīng)這一發(fā)展趨勢(shì)。本文以MA10(Mg、Mn、Al),MA11,MX10(Mg、Mn、Ca),MX11,MAX101(Mg、Mn、Al、Ca),MAX110,MAX111七種熱擠壓鎂合金棒材和MAX(Mg-1.0t%Al-1.5wt%Ca-1.0wt%Mn)熱擠壓平橢圓管材為研究對(duì)象,通過觀察微觀組織,力學(xué)性能分析,系統(tǒng)研究了合金成分對(duì)沉淀相的組成、分布和形貌和力學(xué)性能的影響,探討Al、Ca添加及Al、Ca共同添加對(duì)Mg-Al-Ca-Mn合金組織和力學(xué)性能的影響。通過本課題的研究得出以下結(jié)果:①在MA系合金中,其Al含量添加只能少量提高再結(jié)晶組織含量,無(wú)法顯著細(xì)化晶粒組織,因而其也不能有效提高擠壓棒材的屈服強(qiáng)度,但Al添加可以改善壓縮變形過程中應(yīng)變硬化,顯著提高抗壓強(qiáng)度,Al含量從0.5%增加到1%未影響擠壓棒材的塑性。在MX系合金中,添加Ca元素可以顯著提高擠壓棒材中動(dòng)態(tài)再結(jié)晶組織的含量。隨著Ca含量的增加,合金的屈服強(qiáng)度大幅提高,而抗壓強(qiáng)度提高較少,塑性有一定的改善。②在MAX系合金中,當(dāng)Ca含量由0.5%達(dá)到1%時(shí)可產(chǎn)生顯著的強(qiáng)化,而Al的含量由0.5%增加到1%時(shí),不能顯著提高力學(xué)性能。然而Al元素的添加可以顯著提高抗壓強(qiáng)度。Al和Ca添加在0.5%-1%范圍內(nèi)對(duì)塑性影響較小。Al和Ca同時(shí)添加有助于擠壓過程中動(dòng)態(tài)再結(jié)晶,再結(jié)晶組織細(xì)小,擠壓組織有較多的含Ca的沉淀相,Ca元素由0.5%增加到1%時(shí),沉淀相含量顯著增加。③平橢圓管平板部分和圓弧部分均具有很強(qiáng)的再結(jié)晶織構(gòu),但織構(gòu)分布顯著不同,圓弧部分均更容易形成帶狀交替分布的不同取向的組織,兩個(gè)部位晶粒均比較細(xì)小,但平板部分切面和縱面組織均較圓弧部分更為細(xì)小,變形更均勻。Mg-Al-Ca-Mn熱擠壓平橢圓管沿?cái)D壓方向拉伸力學(xué)性能測(cè)試結(jié)果:屈服強(qiáng)度為255MPa,抗拉強(qiáng)度為278MPa,延伸率為5.1%。
[Abstract]:The research and development of heat resistant magnesium alloy has excellent performance and cheap, so that it can meet the application parts of automobile transmission system under high temperature conditions, has become an important issue to be solved, and the Mg-Al alloy containing Ca can adapt to this trend as well. Based on the MA10 (Mg, Mn, Al, MA11) (MX10, Mg, Mn, Ca, MX11), MAX101 (Mg, Mn, Al, Ca, MAX110, MAX111) seven kinds of hot extruded magnesium alloy bar and MAX (Mg-1.0t%Al-1.5wt%Ca-1.0wt%Mn) hot extrusion flat ellipse pipe as the object of study, through the observation of microstructure, mechanical performance analysis, alloy composition on precipitate composition system research, influence, distribution and morphology and mechanical properties of Al, Ca and Al added, Ca addition on Microstructure and mechanical properties of Mg-Al-Ca-Mn alloy. The following results through this study: 1 in the MA alloy, the Al content increased only a small amount of recrystallization The tissue content, not grain refining, so it can effectively improve the yield strength of the extruded bars, but the addition of Al can improve the compression deformation strain hardening process, significantly improve the compressive strength, the content of Al increased from 0.5% to 1% did not affect the plastic extrusion. In MX alloy, the addition of Ca element can significantly to improve the dynamic recrystallization microstructure of extruded bar content. With the increase of Ca content, the yield strength of the alloy increases, while the compressive strength increases slightly, the plastic has been improved. In MAX alloys, when the Ca content from 0.5% to 1% can produce significantly enhanced, and the content of Al by 0.5% increased to 1%, can significantly improve the mechanical properties. However, the addition of Al can significantly improve the compressive strength of.Al and Ca are added in the 0.5%-1% range of plastic was less affected by.Al and Ca addition contributes to the dynamic extrusion process Recrystallization and recrystallization microstructure, Ca containing more extrusion precipitates, Ca elements increased from 0.5% to 1%, precipitation phase content increased significantly. The flat part and the circular flat elliptical tube has strong recrystallization texture, but the texture distribution was significantly different, are more likely to form part of the arc with alternating distribution of different orientation, two parts of grain are relatively small, but the flat part section and vertical organization than the arc part is more finer, more uniform deformation.Mg-Al-Ca-Mn hot extruding flat elliptical tube along the extrusion direction tensile test results: yield strength 255MPa, tensile strength 278MPa, elongation 5.1%.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG379;TG146.22

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相關(guān)碩士學(xué)位論文 前1條

1 付世偉;Al、Ca添加對(duì)Mg-Al-Ca-Mn合金組織和力學(xué)性能的影響[D];重慶大學(xué);2015年

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本文編號(hào)：1399782