發(fā)布時(shí)間：2018-05-05 14:11

  本文選題：攪拌摩擦工藝 + SiO顆粒　； 參考：《稀有金屬》2015年10期

【摘要】：將SiO2顆粒填入AZ61鎂合金基體上預(yù)先開(kāi)出的溝槽中,利用攪拌摩擦工藝(FSP)成功地將顆粒均勻地?cái)嚢柽M(jìn)鎂合金中。利用掃描電鏡(SEM)觀察了試樣攪拌區(qū)顆粒分布情況,分別對(duì)高溫退火和高溫拉伸試樣的晶粒長(zhǎng)大情況進(jìn)行了觀察,測(cè)量了試樣攪拌區(qū)及其附近區(qū)域的硬度,利用掃描電鏡進(jìn)行了斷口形貌分析并對(duì)試樣高溫變形機(jī)制進(jìn)行了分析。結(jié)果表明:大部分SiO2顆粒被均勻地?cái)嚢柽M(jìn)鎂合金中,僅有少量的顆粒以聚集塊形式存在;未摻入SiO2顆粒的攪拌摩擦試樣攪拌區(qū)平均硬度為HV78,而摻入SiO2顆粒的試樣攪拌區(qū)平均硬度為HV110,提高了HV30左右;合金中的SiO2顆粒有效地抑制了靜態(tài)退火、高溫拉伸和攪拌摩擦過(guò)程中的晶粒長(zhǎng)大,使其保持在3μm以內(nèi);試樣在400℃下以3×10-1s-1的應(yīng)變速率拉伸得到的伸長(zhǎng)率最大,達(dá)到了453%,實(shí)現(xiàn)了材料高應(yīng)變速率下的超塑性。
[Abstract]:The SiO2 particles were filled into the pre-opened grooves on the AZ61 magnesium alloy matrix, and the particles were successfully evenly stirred into the magnesium alloy by friction stir technology. The particle distribution in the agitation zone was observed by SEM, and the grain growth in the high temperature annealed and tensile samples at high temperature was observed, and the hardness of the agitated zone and its adjacent region was measured. The fracture morphology was analyzed by SEM and the deformation mechanism at high temperature was analyzed. The results show that most of the SiO2 particles are stirred into magnesium alloy uniformly, and only a few particles exist in the form of aggregates. The average hardness of friction stir zone without SiO2 particles was HV78, while that of SiO2 particles was HV110, which increased HV30, and the SiO2 particles in the alloy effectively inhibited static annealing. During high temperature tension and friction stirring, the grain grows and keeps within 3 渭 m, and the elongation of the sample is the largest at 4 脳 10-1s-1 strain rate at 400 鈩，

本文編號(hào)：1847995