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小兰花银虫 (著名写手)
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[求助]
能说明 微观结构 对 材料宏观力学影响 的 示意图【PPT用图】，非常感谢！
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想找一个能 简明扼要的说明 金属材料的微观结构 （实验 或模拟得到的 微观结构，如 再结晶后的晶粒细化 等）对材料力学性能影响 或 材料的实际运用 作用及意义 的 精美的图片 做PPT时要用， 但一直没做到合适的，自己归纳又水平不够。 请高手帮忙！非常感谢！ |
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imrsfb
铁杆木虫 (著名写手)
- MM-EPI: 7
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【答案】应助回帖
★ ★
aishan(金币+2): 感谢应助 2011-08-08 11:06:51
小兰花(金币+10): 感谢版主的热情帮助！非常感谢！ 2011-08-08 23:18:10
aishan(金币+2): 感谢应助 2011-08-08 11:06:51
小兰花(金币+10): 感谢版主的热情帮助！非常感谢！ 2011-08-08 23:18:10
很难找你想要的图片，不过下面这个似乎能说明点问题： Microtensile stress-strain curves for submicrometer nanocrystalline aluminum thin films showing two distinct behaviors.7 The curve with the highest strength, gradual deviation from plasticity, and limited ductility is representative of a specimen that maintains its nanocrystalline grain size. By contrast, specimens observed to undergo stress-assisted room-temperature grain growth exhibit lower yield strengths and regions of extended plasticity. Reference：The Micro- and Nanoscale Tensile Testing of Materials D.S. Gianola and C. Eberl JOM，Vol. 61, No.3 pp. 24-35 http://www.tms.org/pubs/journals/jom/0903/gianola-0903.html |
2楼2011-08-08 00:43:07
imrsfb
铁杆木虫 (著名写手)
- MM-EPI: 7
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【答案】应助回帖
★ ★
aishan(金币+2): 辛苦了 2011-08-08 11:07:00
小兰花(金币+8): 非常感谢版主！ 2011-08-08 23:18:31
aishan(金币+2): 辛苦了 2011-08-08 11:07:00
小兰花(金币+8): 非常感谢版主！ 2011-08-08 23:18:31
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这个是个老图，不怎么漂亮，但是能说明问题 Increasing the annealing time decreases the recrystallization temperature for the start of recrystallization.During recrystallization stage, there is a significant drop in tensile strength, hardness and a large increase in the ductility of the material (See Figure 1).  Figure 1. Effect of annealing on tensile strength, hardness, ductility and grain size. Reference：By: Serdar Z. Elgun，September 17, 1999 http://info.lu.farmingdale.edu/d ... nnealingstages.html |
3楼2011-08-08 01:09:41
imrsfb
铁杆木虫 (著名写手)
- MM-EPI: 7
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- 虫号: 472279
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- 性别: GG
- 专业: 金属结构材料
【答案】应助回帖
★ ★
aishan(金币+2): 挺漂亮的图片，看来你是专家啊 2011-08-08 11:07:32
小兰花(金币+7): 版主的知识面真宽！谢谢！ 2011-08-08 23:19:44
aishan(金币+2): 挺漂亮的图片，看来你是专家啊 2011-08-08 11:07:32
小兰花(金币+7): 版主的知识面真宽！谢谢！ 2011-08-08 23:19:44
这个是Twip钢和Trip钢的组织和应力应变示意图，挺漂亮 Figure 2: The stress-strain diagram clearly shows the differing characters of TRIP and TWIP steel. TRIP steel can resist high stresses without deforming. TWIP steel deforms with low stresses, but does not break until strain reaches around 90 percent. refrence： Multi Phase Twinning-Induced Plasticity (TWIP) Steel http://www.keytometals.com/page. ... site=kts&NM=207 |
4楼2011-08-08 01:14:33
小兰花
银虫 (著名写手)
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5楼2011-08-09 00:57:57
imrsfb
铁杆木虫 (著名写手)
- MM-EPI: 7
- 应助: 12 (小学生)
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- 金币: 8101.6
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- 专业: 金属结构材料
【答案】应助回帖
★ ★
aishan(金币+2): 感谢应助 2011-08-09 09:43:40
小兰花(金币+10): 版主的金属学知识好渊博！ 2011-08-09 09:54:37
aishan(金币+2): 感谢应助 2011-08-09 09:43:40
小兰花(金币+10): 版主的金属学知识好渊博！ 2011-08-09 09:54:37
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you can see this paper: Chitin in the exoskeletons of Arthropoda: From ancient design to novel materials science H. Fabritius, C. Sachs, D. Raabe, S. Nikolov, M. Friák, J. Neugebauer http://www.mpie.de/index.php?id=2957  Figure 1. Microstructure of arthropod cuticle using the American lobster Homarus americanus as model (a) Hierarchical organization starting with the acetylglucosamine molecules (I) forming antiparallel chains of α-chitin (II). Eighteen to 25 chitin molecules wrapped with proteins form nanofibrils (III) which aggregate forming chitin protein fibres (IV) that are arranged in horizontal planes where the long axes of the fibrers are all oriented in the same direction around the cavities of the pore canal system. (V). The chitin protein fibres form the typical twisted plywood structure (VI) of the threelayered cuticle (VII). (b) SEM micrograph of a cross section through the cuticle showing epicuticle and the organization of exo- and endocuticle with different stacking heights of the chitin protein fibres (white lines). (c) SEM micrograph of cross-fractured lobster cuticle showing the gradual rotation of the fibres planes around the normal axis (ND) of the cuticle and the interspersed pore canals.  Figure 11. Hierarchical model for lobster cuticle: (I), (II) - α-chitin properties via ab initio calculations; (III) representative volume element (RVE) for a single chitin-protein fiber; (IVa) RVE for chitin-protein fibers arranged in twisted plywood and embedded in mineral-protein matrix; (IVb) RVE for the mineral-protein matrix; (V) homogenized twisted plywood without canals; (VI) homogenized plywood pierced with hexagonal array of canals; (VII) 3-layer cuticle. |
6楼2011-08-09 02:01:14
imrsfb
铁杆木虫 (著名写手)
- MM-EPI: 7
- 应助: 12 (小学生)
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- 帖子: 2477
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- 虫号: 472279
- 注册: 2007-12-04
- 性别: GG
- 专业: 金属结构材料
【答案】应助回帖
★ ★
aishan(金币+2): 感谢应助 2011-08-09 09:43:52
小兰花(金币+15): 非常感谢！一下子找到这么多好资料！ 2011-08-09 09:55:15
aishan(金币+2): 感谢应助 2011-08-09 09:43:52
小兰花(金币+15): 非常感谢！一下子找到这么多好资料！ 2011-08-09 09:55:15
看看这几个有意思的图片： Failure of materials and structures involves many length-scales, from the macroscopic scale to the level of Angstrom where chemical bonds are found (adapted from Buehler and Xu, Nature, 2010). A comprehensive analysis of failure must start at a fundamental level in order to represent key mechanisms of how materials fail. (Images: Buehler group, MIT)  The long term impact of our work is that it will extend our ability to perform structural engineering at the macroscale, to the ultimate scale, the nanoscale. Opening the material scale as design space for new material development may open endless possibilities for development of robust, adaptive, active, and ‘smart’ materials. Ref. Markus J. Buehler* and Theodor Ackbarow，Materials Today，SEPTEMBER 2007 | VOLUME 10 | NUMBER 9  Traditionally different disciplines focus on different length scales. Multiscale modelling of materials across the length scales requires overcoming the borders between the disciplines for a seamless integration of the models on different length scales into one coherent multi-scale modelling framework (After D.G. Pettifor, 1991). http://www.icams.de/content/research-at-icams/research-index.html  Muti length scale engineering design http://www.hero-m.mse.kth.se/ [ Last edited by imrsfb on 2011-8-9 at 03:15 ] |
7楼2011-08-09 03:07:27
