1.報(bào)告會(huì)簡(jiǎn)介
報(bào)告人：Jeffrey M. Wheeler（研究員）
時(shí) 間：2017年6月6日（星期二） 上午09：00（開(kāi)始時(shí)間）
地 點(diǎn)： 友誼校區(qū)公字樓334
主 題： Combinatorial Micromechanics
內(nèi)容簡(jiǎn)介： Micromechanical testing has made significant progress in the last few decades. Advances in instrumentation and techniques have developed new geometries for measuring uniaxial strength and fracture toughness at very small length scales. In addition to increasing the test space envelope in terms of smaller sizes, the development of displacement controlled systems has allowed these properties to be investigated over a wide range of strain rates, even within single samples using strain rate jump and stress relaxation techniques. Using new, high speed actuators, the available test space has also been expanded to reach the high strain rate regime ( >103s-1). To complete the testing envelope, significant effort has been spent on achieving high temperature testing, and recently cryogenic temperature testing has also been achieved. By combining all these capabilities, the micromechanical testing envelope has grown to encompass a significant range of testing temperatures (-100 to 600 °C)and over eight orders of magnitude in strain rates (10-5to 103s-1).This creates the opportunity for plastic deformation mechanism mapping of materials at small scales over a wide range of homologous temperatures.
Diffusion couples have long been a fundamental technique in materials science, allowing the exploration of phase diagrams and diffusion constants. With the advent of the Materials Genome Initiative, diffusion couples and multiples are now being used as a high throughput means to investigate a wide range of materials properties. However, so far only the most fundamental micromechanical technique (nanoindentation) has been used to interrogate mechanical properties of diffusion couples. Here, the potential of applying advanced micromechanical techniques to diffusion couples will be demonstrated in the case of the Al-Cu binary system.
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黨委研究生工作部
材料學(xué)院
2017年6月2日
報(bào)告人簡(jiǎn)介
Jeffrey Wheeler博士2005年本科畢業(yè)于美國(guó)伊利諾伊理工學(xué)院，2009年在英國(guó)劍橋大學(xué)拿到博士學(xué)位，隨后在英國(guó)劍橋大學(xué)高登實(shí)驗(yàn)室開(kāi)展博士后研究。2010年開(kāi)始，在瑞士聯(lián)邦材料實(shí)驗(yàn)室(EMPA)進(jìn)行關(guān)低溫和高溫微納米力學(xué)設(shè)備的研發(fā)，同時(shí)利用先進(jìn)表征手段研究材料在極端環(huán)境下的變形行為。2015年加入瑞士蘇黎士聯(lián)邦理工學(xué)院，成為材料學(xué)院納米冶金實(shí)驗(yàn)室的研究員，目前主要關(guān)注共價(jià)鍵材料的的尺寸效應(yīng)，以及溫度和應(yīng)變速率敏感性。Wheeler研究員參與了多個(gè)研究項(xiàng)目，已發(fā)表51篇國(guó)際性期刊文章。
