共搜索到28047条信息,每页显示10条信息,共2805页。用时:0小时0分0秒281毫秒
Effect of united refining and modification on mechanical properties of A356 aluminium alloys ZUO Xiu-rong(左秀荣), ZHONG Zhi-guo(仲志国) Key Laboratory of Material Physics, Ministry of Education...), B, Sr and RE (cerium-riched mixtures of rare earth) on the mechanical properties of A356 aluminum alloys under T5 and T6 treatment condition were studied by OM, SEM, EDAX, etc. It is found......
Conception of tooling adapted to thixoforging of high solid fraction hot-crack-sensitive aluminium alloys G. VANEETVELD1, A. RASSILI1, J. C. PIERRET1, J. LECOMTE-BECKERS2 1. Thixo Unit, B56... Received 13 May 2010; accepted 25 June 2010 Abstract: Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<φs<1), which involves the processing of alloys in the semi......
Interaction of crack with twins in hot-rolling AZ31 magnesium alloys during in-situ TEM straining experiments WU Luo-yi(吴落义)1, WU Cui-lan(伍翠兰)1, XIA Wei-jun(夏伟军)2, CHEN Zhen-hua(陈振华)2 1. Center..., subsequently the cracks extend into adjacent grains across grain boundaries, and grow along cleavage plane. Multiple twins are observed in hot-rolling AZ31 magnesium alloys, when cracks propagate......
磷对NiAl超塑性行为的影响 李谷松1,郭建亭1,周健1 (1.中国科学院金属研究所高温合金研究室,辽宁,沈阳,110016) 摘要:研究了磷对NiAl超塑性变形的影响.结果表明,磷在晶界的偏聚对NiAl的超塑性变形有重要影响.磷的偏聚阻碍了合金变形过程中的动态回复和动态再结晶,加剧了晶界处孔洞的形成,从而造成了NiAl-P合金较长的加工硬化阶段以及最大伸长率下降,变形激活能升高,应变速率敏感指数减小.因此,磷对NiAl的超塑性变形有害. 关键词:NiAl; 磷; 超塑性变形; [全文内容正在添加中] ......
......
合金化元素对NiAl电子结构的影响 赵栋梁1,杨锋1 (1.钢铁研究总院功能材料研究所,北京,100081) 摘要:运用基于密度泛函理论的离散变分法研究了NiAl晶体及加入合金化元素钪,钛,钒,铬,锰,铁,钴,镍,铜以及锌后的电子结构.通过对NiAl和合金化元素的密立根轨道集居数,差分电荷密度,态密度以及体系结合能的分析,从微观电子结构角度探讨了其合金化的作用.结果表明,铁,钴,镍有助于NiAl晶体塑性的改善. 关键词:合金化元素; 电子结构; NiAl; [全文内容正在添加中] ......
三种NiAl材料的室温摩擦磨损性能 盛立远1,胡壮麒1,周兰章1,郭建亭1,王振生1,谢亿1 (1.中国科学院金属研究所,沈阳,110016;2.湖南科技大学机电工程学院,湘潭,411201) 摘要:测试二元NiAl合金,NiAl-Al2O3-TiC原位内生复合材料以及NiAl-Cr(Mo)-Hf共晶合金的室温摩擦磨损性能,研究了磨损机制.结果表明:NiAl材料的抗磨损性能与材料的硬度和断裂韧性成正比,在磨损过程中硬质陶瓷颗粒能有效地传递应力和起到支撑作用,减轻材料的磨损.因此NiAl-Al2O3-TiC复合材料的抗磨损性能最好,在相同工况下其磨损率为NiAl-Cr(Mo)-Hf共晶合金的1/4-3/4和二元NiAl合金的1/20-1/10.摩擦系数随着三种NiAl材料硬度的提高而降低.三种NiAl材料的室温干摩擦磨损过程受控于塑性变形,其磨损机制主要是磨粒磨损机制,随着载荷的增加......
to the porosity. The specimens processed by SLM showed reversible martensitic transformation (T0=171 °C). PM-processed specimens did not show shape memory effects. Key words: shape memory alloys; powder metallurgy; additive manufacturing; selective laser melting; Cu-based alloys 1 Introduction Arne OLANDER first discovered shape memory alloy (SMA) in 1932, but the importance of shape-memory......
微量元素C对NiAl显微组织和力学性能的影响 郭建亭1,韩萍2,李慧3,齐义辉3 (1.中国科学院金属研究所,辽宁沈阳,110016;2.渤海大学,辽宁,锦州,121000;3.辽宁工业大学,辽宁锦州,121001) 摘要:研究了微量元素C对NiAl合金显微组织和力学性能的影响;结果表明,C微合金化后的NiAl合金组织由单相NiAl组成,随着C含量的增加,横向晶粒尺寸变小.适量的C能够导致多晶NiAl合金的硬度和屈服强度降低,即产生了合金软化的现象. 关键词:NiAl; C微合金化; 合金软化; [全文内容正在添加中] ......
Trans. Nonferrous Met. Soc. China 22(2012) 1190-1196 Characteristic atom sequences of Nb-Mo alloys system in BCC structure and properties of disordered alloys PENG Hong-jian1,2, WU Qing1, LI... 410083, China Received 16 March 2011; accepted 20 February 2012 Abstract: Comprehensively considering energy, volume and electronic structure of alloys, the ninth equation was determined......