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hour219木蟲 (正式寫手)
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[求助]
金屬基復(fù)合材料的摘要~漢譯英~求好心人幫助~
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疊層金屬復(fù)合材料是利用復(fù)合技術(shù)使兩種或兩種以上物理、化學(xué)、力學(xué)性能不同的金屬在界面上實(shí)現(xiàn)牢固的冶金結(jié)合而制備的一種新型材料,它們可以降低成本、改善性能以及節(jié)約貴重金屬。工業(yè)和國防技術(shù)的迅速發(fā)展以及對全球污染控制日益增長的需要,都要求為保存貴重金屬的資源而更加廣泛的使用層疊金屬復(fù)合材料。本論文是國家自然科學(xué)基金資助項(xiàng)目“Pt/PtTi(Pt3Ti)塊體微納米疊層材料固態(tài)合成”的研究內(nèi)容。鉑/鉑鈦金屬間化合物塊體微納米疊層材料是首先制備出Pt/Ti塊體疊層復(fù)合材料然后通過熱擴(kuò)散來實(shí)現(xiàn)的,因此本論文開展了Pt/Ti疊層復(fù)合材料的熱壓擴(kuò)散與軋制變形行為研究。 本文采用熱壓擴(kuò)散和軋制復(fù)合技術(shù),制備了Pt/Ti金屬基疊層復(fù)合材料,采用掃描電鏡(SEM)、X射線衍射(XRD)、電子探針顯微分析(EPMA)、電子萬能試驗(yàn)機(jī)等分析測試手段研究了該材料熱壓擴(kuò)散和軋制變形中的組織結(jié)構(gòu)演變特征、及力學(xué)性能,研究結(jié)果表明: (1)熱壓擴(kuò)散試驗(yàn)中溫度、壓力及擴(kuò)散時(shí)間為影響Pt/Ti界面擴(kuò)散行為及金屬間化合物生成規(guī)律的重要參數(shù)。擴(kuò)散參數(shù)較低時(shí),復(fù)合坯均保持連續(xù)、完整、平直的Ti/Ti3Pt/TiPt/Pt層狀結(jié)構(gòu),高溫高壓(1200℃,20Mpa)條件下Pt、Ti金屬都幾乎完全消耗,金屬間化合物占據(jù)Pt、Ti原來的位置,部分殘余的Pt成島狀鑲嵌在金屬間化合物中。隨溫度的升高,擴(kuò)散方式由較低溫度時(shí)(1000℃)Ti向Pt的單方向擴(kuò)散轉(zhuǎn)變?yōu)?200℃時(shí)較為劇烈的互擴(kuò)散;金屬間化合物的生成受Pt、Ti原子擴(kuò)散程度的影響,先形成Ti3Pt而后逐漸向TiPt轉(zhuǎn)變,最終達(dá)到平衡,且金屬間化合物厚度隨溫度的升高而增厚。保持其它參數(shù)不變的情況下加大壓力或延長擴(kuò)散時(shí)間均對擴(kuò)散有類似的促進(jìn)作用,但其影響遠(yuǎn)小于溫度的作用。其它條件不變,壓力7Mpa 和10Mpa時(shí)的擴(kuò)散距離和金屬間化合物厚度變化不大(相差在1μm之內(nèi)),15Mpa時(shí)擴(kuò)散距離和金屬間化合物厚度略有增加,但增幅不大(增加約2μm);其它條件不變0.5~1h的時(shí)間區(qū)間內(nèi)擴(kuò)散原子的變化并不明顯,但當(dāng)時(shí)間延長至2h,界面附近的原子擴(kuò)散顯著加劇,金屬間化合物厚度也隨之增加。 (2)軋制復(fù)合初始熱壓擴(kuò)散溫度和時(shí)間分別為800℃,1h,在此條件下可以保證Pt、Ti有效連接,且在界面處形成較少的金屬間化合物(α-Ti+Ti3Pt)。變形量達(dá)到90%的Pt/Ti復(fù)合坯都不可避免地出現(xiàn)了不均勻的變形,復(fù)合坯各金屬層厚度寬窄不一,Ti層的厚度變化尤其明顯,某些Ti層較薄的地方甚至出現(xiàn)斷裂的情況,Pt層依然保持完好。在較高溫度(700℃)退火時(shí),退火頻次越大,所得到的層狀結(jié)構(gòu)越連續(xù)完整,而在較低溫度(500℃)退火時(shí),提高退火頻次時(shí),層狀結(jié)構(gòu)反而不如退火頻次較低時(shí)的樣品保持的好。凡經(jīng)中間等溫退火工藝處理的樣品,其層狀結(jié)構(gòu)均比不經(jīng)退火直接軋制的樣品保持的更好,其中道次退火變形量為50%,退火溫度為500℃時(shí)制得的樣品層狀結(jié)構(gòu)的均勻性和連續(xù)性為最佳。與熱壓擴(kuò)散相比,軋制復(fù)合法制得的試樣擴(kuò)散比較輕微,變形量達(dá)到90%的樣品雖經(jīng)多次退火,但Pt、Ti元素的擴(kuò)散仍只局限于界面周圍,而沒有更進(jìn)一步向?qū)Ψ交w擴(kuò)散。700℃退火得到的金屬間化合物均為(α-Ti+Ti3Pt)500℃退火得到的金屬間化合物均為Ti3Pt。與冷軋相比溫軋而得的復(fù)合坯的Ti層也存在斷裂的現(xiàn)象,隨著變形量增大,中心部位的層狀結(jié)構(gòu)保持的比較均勻、完整,可以看到明顯的軋制變形特征,但兩邊的層狀結(jié)構(gòu)與中心部位相比則比較不均勻,薄厚不一;溫軋過程中并沒有生成金屬間化合物,或者生成了少量、難以觀察到的不連續(xù)金屬間化合物。 (3)軋制樣品的力學(xué)性能與斷裂結(jié)果。道次退火變形量(30%或50%)對試樣的界面硬度影響不大,無論在500℃還是700℃退火其相差不超過10HV;但溫度對界面硬度的影響比較顯著,700℃退火的樣品比500℃退火的樣品界面硬度高出100HV以上;溫軋樣品界面硬度僅為103.6HV。50%/500℃退火得到的樣品拉伸性能最好,其所能承受的最大載荷為297.451N,最大應(yīng)力為576.455N/mm2,強(qiáng)度僅次于50%/700℃退火樣品,但其延展性遠(yuǎn)好于其他樣品,故綜合性能最佳。不經(jīng)退火的Pt/Ti復(fù)合材料斷裂存在兩個(gè)階段,界面上的金屬間化合物層先于金屬層以脆性斷裂的方式斷裂,Pt、Ti金屬層則隨后發(fā)生韌性斷裂,經(jīng)過退火處理的樣品斷口更加均勻,斷裂過程更加協(xié)調(diào)一致。 |

金蟲 (小有名氣)

至尊木蟲 (職業(yè)作家)
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太長了,翻譯了一半,其他的另請高明吧。 laminated metal composite is a new kind of material that is made from two or more types of metals possessing different physical, chemical and mechanical properties via composite technology that obtains strong metallurgical bonding between interfaces. It can lower the cost, improve properties and economize noble metal. The booming of industry and defense technology as well as the increasing need of the control for global pollution, require the conservation of noble metal while enlarge the utilization of laminated metal composite. This thesis is supported by National Science Foundation of China entitled “The solid synthesis of Pt/PtTi(Pt3Ti) block micro-nano laminated material”. Pt/PtTi intermetallic compound micro-nano laminated material is obtained by thermal diffusion after the synthesis of Pt/Ti bulk laminated composite. Therefore, the thermal diffusion and rolling deformation of the Pt/Ti laminated composite are investigated in this paper. In this paper, the technology of thermal diffusion and rolling was carried on to prepare PT/Ti laminated composite. Scanning electron microscope (SEM), X-ray diffraction (XRD), Electron probe microanalysis (EPMA), electronic universal testing machine, etc. were used to characterized the organization structure evolution feature and the mechanic properties of the as-prepared material during thermal diffusion and rolling deformation. The results shown that: (1) The temperature, pressure and diffusion time were the important parameters that influence the interfacial diffusion of Pt/Ti and the law of the formation of intermetallic compound during thermal diffusion experiment. When the diffused parameter is relative low, the composite slabs all kept continuous, completed, and straight Ti/Ti3Pt/TiPt/Pt layer structure. Pt and Ti were almost consumed entirely under the condition of high temperature and high pressure (1200℃,20Mpa). The sites of Pt and Ti were replaced by intermetallic compound where a part of residual isle-like Pt inlaying the intermetallic compound. With the increase of temperature, the diffused mode were transformed from Ti unidirectionally diffusing to Pt at low temperature (1000℃) to intense interdiffusion at 1200℃. The formation of intermetallic compound was effected by the diffusion of Pt and Ti atoms, forming Ti3Pt and then changing to TiPt gradually until the balance occurred. The thickness of the intermetallic compound increased when the temperature was rising up. Keeping other parameters while increasing the pressure or lengthening the diffused time all showed the analogue promoted effect. However, the impact was far lower than temperature. When the pressure was 7Mpa and10Mpa the transformation of the diffused range and the thickness (fluctuate in 1μm) of intermetallic compound is not obvious. When the pressure was 15Mpa the diffused range and the thickness of intermetallic compound increased a little but not too much (reach at about 2μm). Keeping other parameters, the transformation of diffused atoms was not evident in the period of 0.5~1h. Nevertheless, When prolonging the time to 2h, the diffusion of atoms near the interface increased dramatically and the thickness of the intermetallic compounds increased as well. |
木蟲 (正式寫手)

木蟲 (正式寫手)

木蟲 (正式寫手)

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