本文選題：氫化脫氫　切入點(diǎn)：納米純鎂塊體　出處：《太原理工大學(xué)》2017年碩士論文

【摘要】：為了改善鎂合金的綜合性能,研究者提出了許多方法,其中,晶粒細(xì)化是一種常用的高效技術(shù)。然而,隨著晶粒尺寸的不斷減小,晶界會(huì)阻礙位錯(cuò)的產(chǎn)生和運(yùn)動(dòng),從而降低超細(xì)晶材料的加工硬化能力、塑性變形和延展性。因此,金屬材料的強(qiáng)度和塑性不能同時(shí)提高。為及解決這一問(wèn)題,許多科研學(xué)者提出了雙峰組織,該組織對(duì)材料的強(qiáng)度和塑性具有平衡的效果。在本文研究中,將球形霧化純鎂粉末通過(guò)氫化脫氫,放電等離子體燒結(jié)和熱擠壓制備具有納米晶粒(NG)區(qū)域和粗粒度(CG)區(qū)域的雙峰粒度分布的大量鎂材料。本文主要采用HD技術(shù)制備了納米結(jié)構(gòu)Mg粉末,然后用兩種不同的方法制備雙峰粒度分布純鎂組織。方法一:通過(guò)不完全氫化制備具有雙峰結(jié)構(gòu)的Mg粉末。方法二:將完全HD粉末和原始粉末混合獲得雙峰結(jié)構(gòu)粉末。結(jié)果如下:方法一:隨著氫化程度增加和納米晶分?jǐn)?shù)增加,拉伸強(qiáng)度越高,伸長(zhǎng)率越低。當(dāng)氫化率為92.3%時(shí),試樣的綜合性能比較好,其中拉伸強(qiáng)度為287 MPa,伸長(zhǎng)率6.1%。方法二:隨著HD粉末質(zhì)量分?jǐn)?shù)的增加,拉伸強(qiáng)度增加但伸長(zhǎng)率降低。其中含70wt.%HD粉末試樣具有最佳綜合性能。屈服強(qiáng)度,極限拉伸強(qiáng)度和伸長(zhǎng)率分別為246 MPa,291 MPa和5.8%。
[Abstract]:In order to improve the comprehensive properties of magnesium alloys, many methods have been proposed, in which grain refinement is a common and efficient technique. However, with the decreasing of grain size, grain boundaries will hinder the generation and movement of dislocations. Therefore, the strength and ductility of metallic materials can not be improved simultaneously. In order to solve this problem, many researchers have proposed bimodal microstructure. The microstructure has the effect of balancing the strength and plasticity of the material. In this study, the spherical atomized pure magnesium powder was hydrogenated for dehydrogenation. A large number of magnesium materials with bimodal particle size distribution in the nanocrystalline (NGN) and coarse-grained (CGG) regions were prepared by spark plasma sintering and hot extrusion. In this paper, nanocrystalline mg powders were prepared by HD technique. Then two different methods were used to prepare pure magnesium microstructure with bimodal particle size distribution. Method 1: mg powder with double peak structure was prepared by incomplete hydrogenation. Method 2: mixing complete HD powder and original powder to obtain double peak structure. The results are as follows: method one: with the increase of hydrogenation and the increase of nanocrystalline fraction, The higher the tensile strength, the lower the elongation. When the hydrogenation rate is 92.3, the comprehensive properties of the sample are better, in which the tensile strength is 287 MPa and the elongation is 6.1. Method two: with the increase of the mass fraction of HD powder, The tensile strength, ultimate tensile strength and elongation were 246MPA ~ (291) MPa and 5.8m ~ (-1), respectively, and the tensile strength, ultimate tensile strength and elongation were 246MPA ~ (291) MPa and 5.8m ~ (-1), respectively.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG146.22;TG379

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