杨志刚
金属材料中的相变,高强度非调质中厚钢板,新型空冷贝氏体系列钢种及应用,钢中铁素体在夹杂物上形核机制
个性化签名
- 姓名:杨志刚
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学术头衔:
博士生导师
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学科领域:
生物化学
- 研究兴趣:金属材料中的相变,高强度非调质中厚钢板,新型空冷贝氏体系列钢种及应用,钢中铁素体在夹杂物上形核机制
杨志刚教授,1984.9-- 1989.7,清华大学机械工程系、材料科学与工程系及社会科学系,本科, 获工学学士及法学学士。 1991.9 -- 1993.7,清华大学材料科学与工程系,硕士研究生,获工学硕士。 1993.7 -- 1996.3,清华大学材料科学与工程系,博士研究生,获工学博士。 1996.4 -- 至今,清华大学材料科学与工程系,教授。 1996.6 -- 1996.10,日本茨城大学访问学者。 1997.7 -- 1999.7,日本茨城大学日本学术振兴会(JSPS)博士后研究员。 2001.7 -- 2001.12,美国柏克利劳伦斯国家实验室(Lawrence Berkeley National Lab.)访问学者。研究项目:金属材料中的相变,高强度非调质中厚钢板,新型空冷贝氏体系列钢种及应用,钢中铁素体在夹杂物上形核机制。获得的奖励: 2002年,国家教育部推荐国家科技进步奖二等奖;2001年,杜邦科技创新奖;1997年,国家教委科技进步甲类一等奖; 1996年,清华大学基础理论研究奖。杨志刚教授的论著:专著2部,英文文章40 篇, 中文文章:50 篇,其中SCI收录40篇。担当社会职务:中国金属学会第七届理事会理事,中国机械工程学会材料学会理事;中国机械学会高级会员;中国材料研究会青年工作委员会副秘书长。
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【期刊论文】A DISCRETE LATTICE PLANE ANALYSIS OF COHERENT F.C.C./B1 INTERFACIAL ENERGY
杨志刚, Z.-G. YANG† and M. ENOMOTO‡
Acta mater. Vol. 47, No.18, pp. 4515-4524, 1999,-0001,():
-1年11月30日
A discrete lattice plane, nearest neighbor, broken bond model with constant bond energies, which had been used to calculate the energy of coherent interphase boundaries in substitutional alloys, was extended to a ternary substitutional-interstitial system to study the chemical interfacial energy between a f.c.c. solid solution and a B1(NaCl) compound. When the regular solution interaction coeffcient of substi-tutional (metal) atoms is positive, interstitial (non-metallic) atoms which have different bond energies with the two metal atoms tend to increase both the composition difference and the interfacial energy. Even when the interaction coeffcient of metal atoms is negative, a miscibility gap and a gradual composition change across the interface occur. The anisotropy of the interfacial energy varies widely according to the magnitude of interaction between the metal and the non-metallic atoms.
Carbides, Nitrides, Phase equilibria, Interfacial energy
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【期刊论文】Calculation of the Interfacial Energy of B1-Type Carbides and Nitrides with Austenite
杨志刚, Z.-G. YANG and M. ENOMOTO
METALLURGICAL AND MATERIALS TRANSACTIONS A VOLUME 32A, FEBRUARY 2001-267,-0001,():
-1年11月30日
The interfacial energy of NaC1 (B 1)-type carbides and nitrides that have a cube-on-cube orientation relationship with austenite was calculated using a discrete lattice-plane (DLP), nearest-neighbor broken-bond (NNBB) method. The required bond energies were evaluated from Miedema's semiempir-ical model for alloys and available thermodynamic data. For Ti, V, Zr, and Nb carbides and nitrides, a significant chemical interfacial energy arises from the large difference in the concentration of nonmetallic atoms between austenite and the compound phase. In contrast to binary fcc/fcc cases, where (111)-type interfaces have the smallest interfacial energy, (100)- and (111)-type interfaces have been found to have the smallest and the largest energy, respectively, of all orientations. The structural component of the interfacial energy arising out of lattice misfit is likely to be larger than the chemical component for these compounds. The orientation dependence of the total interfacial energy and the associated Wulff construction indicate that, due to the retention of the strong anisotropy of the chemical interfacial energy, the equilibrium shape of these B 1 compounds is a cube, possibly with facets at comers and edges over a wide temperature range.
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【期刊论文】The mechanism of bainite transformation in steels
杨志刚, H.-S. Fang*, J.-B. Yang, Z.-G. Yang, B.-Z. Bai
Scripta Materialia 47 (2002) 157-162,-0001,():
-1年11月30日
Sympathetic nucleation andled gewise growth are competitive with each other throughout the bainite formation in steels. Many evidences are provided to support this mechanism as follows: ultra-fine structures of bainite and its surface relief, and carbide nucleation inside austenite at the interface of ferrite/austenite, etc.
Bainite, Ultra-fine structure, Surface relief, Carbide, Morphology
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杨志刚, Z.-G. Yang a, M. Enomoto b, *
Materials Science and Engineering A332 (2002) 184-192,-0001,():
-1年11月30日
The interfacial energy of B1 (NaCl)-type carbides and nitrides (designated ξ) having Baker-Nutting orientation relationship with ferrite (χ), i.e. (001)ξ//(001) and [110]ξ//[100], was studied by discrete lattice plane, nearest neighbor broken bond method. The carbide (or nitride) lattice was contracted along the [001] direction so as to make the two lattices isomorphous and coherent at all interface orientations. The chemical interfacial energy of this hypothetical compound is highly anisotropic due to the difference in the M (metal atom)-I (non-metallic atom) coordination number between, for example, (001)-and (100)-type interfaces that would be equivalent in a cubic lattice. As a result, the equilibrium shape is a square plate with (001) broad faces. The anisotropy of the strain energy arising out of a large misfit along the [001] direction may override the anisotropy of chemical energy and dictate the observed square plate morphology of carbides and nitrides in ferrite.
Iron, Carbide, Nitride, Phase equilibrium, Interfacial energy
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【期刊论文】Electroless Cu Deposition on a TiN barrier in CuSO4-HF Solution
杨志刚, Sheng Zhong, a, Zhi-Gang Yang, z, Jian Cai, b, Hao-Jie He, Jin-Sheng Wen, and Chao Liu a
Journal of The Electrochemical Society, 1527 1-8 2005,-0001,():
-1年11月30日
Electroless Cu deposition on a TiN barrier in a CuSO4-HF solution by separated electrodes of a Si wafer and a TiN/Ti/SiO2/Si substrate has been studied. In this electroless Cu plating method, two substrates are fixed on a base made by polystyrene without an external circuit. During plating the Si wafer is oxidized by hydrofluoric acid and releases free electrons; F−ions transmit the free electrons to the TiN/Ti/SiO2/Si substrate, and Cu2+ ions accept the electrons and then directly deposit them on the TiN surface. The morphology, surface coverage, average grain size, crystallography, and adhesion of the as-deposited Cu films on the TiN surface are related to the distance between the two substrates, bath temperature, and concentration of HF and CuSO4. During the plating, Cu is also deposited on the Si wafer and the properties of the Cu films on the Si wafer are discussed in the paper as well. The effect of HF on the TiN barrier in this electroless Cu deposition method is examined by X-ray photoelectron spectroscopy.
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杨志刚
,-0001,():
-1年11月30日
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杨志刚, 方鸿生, 白秉哲, 徐平光, 张弛, 刘东雨
《金属热处理》,2002,27(11):1~8,-0001,():
-1年11月30日
简要地总结了清华大学贝氏体相变研究组在贝氏体相变领域的主要研究成果。包括以下方面:①利用TEM、AFM、STM发现了钢及有色合金中的贝氏体超精细结构;②利用STM发现贝氏体表面浮突大多是由与超亚单元相对应的“帐篷型”小浮突群组成的;③利用TEM和STM证实了三维巨型台阶存在的普遍性和可动性;④发现钢中贝氏体碳化物在α/γ界面的γ侧形核并向奥氏体内生长;⑤概述了贝氏体的激发形核-台阶长大机制及其理论计算;⑥用前述相变机制解释了贝氏体的多层次复杂结构,以及上贝氏体、下贝氏体等不同形态的形成原因。
贝氏体, 精细结构, 浮突, 激发形核-台阶长大机制
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杨志刚, 方鸿生, 杨金波, 白秉哲
金属学报,2003,41(5):449~457,-0001,():
-1年11月30日
简要地总结了国内近年来在贝氏体相变理论研究方面的主要成果,包括以下方面:(1)发现钢中的贝氏体超精细结构;(2)贝氏体表面浮突完全由贝氏体铁索体长大过程中形变产生,单一超亚单元对应的浮突呈帐篷型;(3)贝氏体铁索体宽面上存在三维巨型台阶,在近NW关系下相变单元宽面接近(335)t,为扩散型界面;(4)发现钢中贝氏体碳化物在a/γ界面的γ侧形核并向奥氏体内生长;(5)建立了贝氏体激发形核一台阶长大模型,理论计算表明这种机制是合理的,它成功地解释了贝氏体的多层次复杂结构,以及上贝氏体、下贝氏体等不同形态的形成原因等。
贝氏体相变, 精细结构, 表面浮突, 激发形核-台阶长大机制
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【期刊论文】钢中夹杂物与奥氏体基体热膨胀系数差异导致的热应力和应变能研究*
杨志刚, 潘涛, 白秉哲, 方鸿生
金属学报,2003,39(10):1037~1042,-0001,():
-1年11月30日
考虑基体的屈服,对钢中的球形夹杂物和奥氏体基体之间因热膨胀系数差在降温过程中产生的热应力、应变和应变能作了理论研究。大的过冷度和热膨胀系数差异是产生大的热应力、应变和高应变能的主要原因。在现实条件下,夹杂物的Young'S模量和Poisson比的变化对上述参量产生的影响不大。主要计算了几种典型的夹杂物和奥氏体产生的热应力、应变和应变能。结果显示,即便对于极限状态的“刚性”夹杂物,热应力形成的应变能也比相变化学驱动力小1-2个数量级。
夹杂物, 热膨胀系数, 热应力, 应变能
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