本文選題：純鎂　切入點(diǎn)：等通道擠壓　出處：《哈爾濱工程大學(xué)學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：由于鎂為密排六方結(jié)構(gòu),室溫塑性較差,目前純鎂的等通道擠壓(equal channel angular pressing,ECAP)研究一般是在高溫下進(jìn)行的。為了實(shí)現(xiàn)純鎂在室溫下的ECAP大變形,本次實(shí)驗(yàn)中采用創(chuàng)新性方法,將方鐵套包套的工業(yè)純鎂圓棒在通道橫截面尺寸為12 mm×12 mm的模具中進(jìn)行室溫等通道轉(zhuǎn)角擠壓,借助于純鐵優(yōu)良的加工塑性以及在擠壓過程中對純鎂產(chǎn)生的較強(qiáng)束縛力,成功制備了表面光滑且無明顯裂紋的純鎂擠壓試樣,使用光學(xué)顯微鏡(OM),微機(jī)控制電子萬能試驗(yàn)機(jī)研究了一道次擠壓后純鎂的組織和力學(xué)性能。最后,用掃描電子顯微鏡(SEM)對拉伸斷口進(jìn)行了觀察。結(jié)果表明,一道次擠壓后,純鎂的晶粒得到明顯細(xì)化,晶粒尺寸由最初的幾百微米下降到幾個(gè)微米,屈服強(qiáng)度和拉伸強(qiáng)度分別達(dá)到97 MPa和118 MPa,比未擠壓前明顯提高。同時(shí),由于在ECAP過程中試樣發(fā)生了劇烈塑性形變,擠壓前后斷口形貌明顯不同。
[Abstract]:The six party due to the close packed structure, poor plasticity at room temperature, the pure magnesium ECAP (equal channel angular pressing, ECAP) research is generally done at high temperature. In order to achieve the pure magnesium at room temperature ECAP large deformation, innovative methods in this experiment, the iron mold package the set of pure magnesium rod in the channel cross-section size of 12 mm * 12 mm in room temperature ECAP, with excellent plasticity and iron processing of pure magnesium in the extrusion process with strong binding force, successful preparation of pure magnesium surface is smooth and no obvious crack extrusion the sample, using optical microscopy (OM), a research machine passes and mechanical properties of pure magnesium electronic universal testing control microcomputer. Finally, using scanning electron microscopy (SEM) on the tensile fracture morphology was observed. The results showed that one passes, pure magnesium The grains are refined obviously, the grain size decreased from hundreds of microns to a few microns, the yield strength and tensile strength reached 97 MPa and 118 MPa respectively, significantly higher than not before extrusion. At the same time, because the sample in ECAP during severe plastic deformation before and after extrusion broken lip profile significantly different.

【作者單位】： 太原理工大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51474152)
【分類號】：TG379

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