發(fā)布時(shí)間：2018-10-14 18:17

【摘要】：鎂合金具有比強(qiáng)度高、比剛度高、減震性和導(dǎo)熱性良好等優(yōu)點(diǎn),得到了航空、航天和電子產(chǎn)品等行業(yè)的青睞。而鎂合金是密排六方結(jié)構(gòu),所以其室溫下塑性變形能力較差,變形的過程當(dāng)中容易出現(xiàn)強(qiáng)烈的基面織構(gòu),這就大大限制了鎂合金的應(yīng)用。為了解決鎂合金的應(yīng)用難題,本論文采用等通道角軋制工藝對(duì)AZ31鎂合金進(jìn)行研究,并對(duì)室溫等通道角軋制與150℃等通道角軋制工藝進(jìn)行了對(duì)比研究。通過實(shí)驗(yàn)手段,研究了等通道角軋制對(duì)AZ31鎂合金板材組織性能的影響規(guī)律,為鎂合金的生產(chǎn)實(shí)際提供更好地理論依據(jù)與指導(dǎo)。本次實(shí)驗(yàn)系統(tǒng)的研究了室溫ECAR和150℃ECAR對(duì)于AZ31鎂合金板材組織性能的影響,并對(duì)比分析了兩種工藝的軋制產(chǎn)品。得到如下結(jié)論:①室溫等通道角軋制AZ31鎂合金板材時(shí),隨著軋制道次的增加,板材的晶粒尺寸變化不大,AZ31鎂合金板材的基面織構(gòu)得到顯著改善,由原始的8.19減弱到4.54。②經(jīng)室溫等通道角軋制后的鎂合金板材綜合性能得到大幅度改善。其抗拉強(qiáng)度由原始的278.0MPa增加到295.4MPa,屈服強(qiáng)度由原始的128.0MPa降低到79.8MPa,n值由原始的0.29提高到0.45,r值由原始的1.92降低到1.13,杯突值由原始的2.75mm提高到4.38mm。③150℃等通道角軋制AZ31鎂合金時(shí),隨著軋制道次的增加,板材的晶粒尺寸變化同樣不大,AZ31鎂合金板材的基面織構(gòu)同樣得到大幅度改善,由原始的8.19減弱到3.58。④150℃等通道角軋制后板材的強(qiáng)度明顯提高,塑性得到改善。其抗拉強(qiáng)度由原始的278.0MPa增加到307.0MPa,屈服強(qiáng)度由原始的128.0MPa降低到87.0MPa,n值由原始的0.29提高到0.49,r值由原始的1.92降低到0.90,板材各向異性得到大幅度改善。
[Abstract]:Magnesium alloy has the advantages of high specific strength, high specific stiffness, good shock absorption and thermal conductivity, and has been favored by aviation, aerospace and electronic products. The magnesium alloy is a hexagonal structure, so its plastic deformation ability is poor at room temperature, and it is easy to appear strong basic texture during the deformation process, which greatly limits the application of magnesium alloy. In order to solve the application problem of magnesium alloy, the equal channel angle rolling technology was used to study the AZ31 magnesium alloy in this paper, and the equal channel angle rolling process at room temperature and 150 鈩，

本文編號(hào)：2271243