本文關(guān)鍵詞：銥單晶的納米壓痕尺寸效應(yīng)研究　出處：《貴金屬》2016年01期 　論文類型：期刊論文

  更多相關(guān)文章： 金屬材料 銥單晶 壓痕尺寸效應(yīng) 納米壓痕

【摘要】：采用納米壓痕技術(shù)和原子力顯微鏡對(duì)銥(Ir)單晶(100)和(110)取向的載荷-位移曲線、彈性模量、壓痕形貌、壓痕硬度-加載深度等進(jìn)行了研究。結(jié)果表明,Ir(100)與Ir(110)單晶的彈性模量分別為477和493 GPa;加載深度為10~2500 nm時(shí),Ir單晶的納米壓痕硬度存在壓痕尺寸效應(yīng),在10~500nm時(shí)表現(xiàn)更為強(qiáng)烈,表明隨著加載深度的增加,單晶材料的硬度減小;基于Nix-Gao模型,計(jì)算出Ir(100)和Ir(110)單晶的納米硬度H0分別為2.32和2.46 GPa,當(dāng)加載深度分別大于4910和5220 nm時(shí),Ir單晶的納米硬度不存在尺寸效應(yīng),可作為金屬銥硬度測(cè)試的重要依據(jù);采用硬度和深度的冪律關(guān)系計(jì)算出Ir(100)和Ir(110)單晶的尺寸效應(yīng)因子(m)分別為0.44和0.48,該值遠(yuǎn)遠(yuǎn)大于其他金屬和半導(dǎo)體材料,這種反�，F(xiàn)象可能與銥原子間的異常強(qiáng)的交互作用有關(guān)。
[Abstract]:The load-displacement curves, elastic modulus and indentation morphology of iridium iridium iridium single crystal (100) and (110)) were investigated by nano-indentation technique and atomic force microscope (AFM). The indentation hardness and loading depth were studied. The results show that the elastic modulus of single crystal is 477 and 493GParespectively. The indentation size effect exists in the hardness of nanocrystalline ir crystal at the loading depth of 10 ~ 2500nm, which is more intense at 105nm, indicating that the indentation hardness increases with the increase of loading depth. The hardness of single crystal material decreases; Based on the Nix-Gao model, the nanocrystalline hardness H0 was calculated to be 2.32 and 2.46 GPa, respectively. When the loading depth is greater than 4910 nm and 5220 nm respectively, there is no size effect on the hardness of ir single crystal, which can be used as an important basis for testing the hardness of iridium. The size effect factors (m) of single crystal Irn100) and Irn 110) calculated by the power law relation of hardness and depth are 0.44 and 0.48, respectively. This value is much larger than that of other metals and semiconductors. This anomaly may be related to the strong interaction between iridium atoms.
【作者單位】： 貴研鉑業(yè)股份有限公司稀貴金屬綜合利用新技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室昆明貴金屬研究所;
【基金】：NSFC-國(guó)家自然科學(xué)基金云南省聯(lián)合基金(U1202273) 國(guó)家自然科學(xué)基金(51501075) 云南省院所技術(shù)開(kāi)發(fā)專項(xiàng)(2014DC018)
【分類號(hào)】：TB383.1;TG146.34
【正文快照】： 常規(guī)來(lái)看,金屬材料的力學(xué)性能與材料的尺度并無(wú)必然的聯(lián)系,而主要與成分和顯微組織有關(guān),例如材料科學(xué)中經(jīng)常提到的霍爾-佩奇(Hall-Petch)公式,即材料的晶粒尺寸越細(xì)小,強(qiáng)度越高,該關(guān)系在晶粒尺寸為微米尺度以上時(shí)具有普適性。但是,最近幾十年,關(guān)于金屬材料在微納米尺度下的力

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本文編號(hào)：1435939