材料期刊网

Homogeneous Plastic Flow of Fully Amorphous and Partially Crystallized Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Metallic glass

Q.WANG , J.J.Bl , in , M.Suery , B.Van de Moortele , J.M.Pelletier

材料科学技术（英文）

The homogeneous plastic flow of fully amorphous and partially crystallized Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass (Vit1) has been investigated by compression tests at high temperatures in supercooled liquid region. Experimental results show that at sufficiently low strain rates, the supercooled liquid of the fully amorphous alloy reveals Newtonian flow with a linear relationship between the flow stress and strain rate. As the strain rate is increased, a transition from linear Newtonian to nonlinear flow is detected, which can be explained by the transition state theory. Over the entire strain rate interval investigated, however, only nonlinear flow is present in the partially crystallized alloy, and the flow stress for each strain rate is much higher. It is found that the strain rate-stress relationship for the partially crystallized alloy at the given temperature of 646 K also obeys the sinh law derived from the transition state theory, similar to that of the initial homogeneous amorphous alloy. Thus, it is proposed that the flow behavior of the nanocrystalline/amorphous composite at 646 K is mainly controlled by the viscous flow of the remaining supercooled liquid.

关键词: Homogeneous plastic flow , null

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

321-Q370q复合板焊接冷裂纹敏感性试验研究

王小华 , 辛宝 , 撒世勇 , 吴伦发

材料开发与应用 doi:10.3969/j.issn.1003-1545.2008.06.015

Q370q钢是武汉钢铁公司和中铁大桥工程局共同研究开发的新型桥梁用钢.为了达到永久性防腐蚀的目的,采用爆炸焊接法制成321-Q370q复合板.本文研究了321-Q370q复合板焊接冷裂纹敏感性,试验结果表明:321-Q370q复合板具有优良的抗裂性能.

关键词: 321-0370q复合板 , 冷裂纹敏感性 , 试验

桥梁钢Q345q疤状缺陷分析

余宏伟，王世森，王孝东，洪君

物理测试

针对鄂钢轧制的部分宽厚板表面出现结疤现象，应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察，对形成原因进行分析并提出改进措施。结果表明:疤状缺陷为块状的非金属夹杂/渣，并在钢板表面形成凹坑，其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等，其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中，通过去除钢水中夹杂物和清理铸坯等，减少非金属夹杂/渣，以提高钢板表面质量。

关键词: Q345q , scar defect , plate , non-metallic inclusions , non-metal lards

桥梁钢Q345q疤状缺陷分析

余宏伟 , 王世森 , 王孝东 , 洪君

物理测试

针对鄂钢轧制的部分宽厚板表面出现结疤现象,应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察,对形成原因进行分析并提出改进措施。结果表明：疤状缺陷为块状的非金属夹杂/渣,并在钢板表面形成凹坑,其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等,其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中,通过去除钢水中夹杂物和清理铸坯等,减少非金属夹杂/渣,以提高钢板表面质量。

关键词: Q345q , 疤状缺陷 , 钢板 , 非金属夹杂 , 非金属夹渣

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

Effect of Thermomechanical Controlled Processing Parameters on the Microstructure and Properties of Q460q Steel

WANG Lei , GAO Cai-ru

钢铁研究学报(英文版)

Thermal mechanical control processing (TMCP), the combination of controlled rolling and controlled cooling, provides a powerful means of developing high-strength low alloy (HSLA) steels by intensive microstructural control. In the present investigation, the effects of TMCP parameters, consisting of the finish cooling temperature and the start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460q steel have been studied by tensile, Charpy impact tests, optical microscopy. The TMCP parameters for Q460q steel have been optimized by laboratory experiments. And the microstructure and properties of industrial product were coincident with the results of laboratory experiments.

关键词: ;TMCP;mechanical properties;M/A constituent;Q460q steel

正交q-相干态的量子统计性质

刘友文 , 陈昌远

量子电子学报 doi:10.3969/j.issn.1007-5461.2000.01.005

本文构造了正交q-相干态,研究了它的压缩性质、反聚束效应等量子统计性质,并数值计算了变形参数q的影响。

关键词: 正交q-相干态 , 压缩性质 , 反聚束效应

321-Q370q复合板焊接性能试验研究

王小华 , 撒世勇 , 侯发臣 , 张义涛

材料开发与应用 doi:10.3969/j.issn.1003-1545.2009.02.011

桥梁结构复杂,构件制作时需大量采用焊接,焊接的方法主要是埋弧自动焊,为了验证321-Q370q复合板能否满足桥梁用钢的焊接要求,对复合板埋弧焊接头进行了一系列性能试验.试验结果表明,焊接接头各项性能均能满足相关标准要求.

关键词: 321-Q370q复合板 , 埋弧自动焊 , 性能试验

Q345钢板卷曲裂纹分析

龚桂仙 , 杨志婷

物理测试 doi:10.3969/j.issn.1001-0777.2005.03.014

对18 mm厚度规格的Q345热轧钢板卷曲裂纹试样进行了金相分析.结果表明,钢板板边存在严重的剪切缺陷(台阶和小裂纹)以及由冷剪切引起的性能变化(硬度增高、塑性降低)是导致钢板在卷曲过程中产生裂纹的主要原因.建议对冷剪切后的板边进行适当热处理,以消除冷剪切造成的不良影响.

关键词: Q345钢板 , 裂纹 , 剪切缺陷