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体中的溶解度增大,合理地解释了复合场下显微硬度最大这一现象.这是由于Cu在α(Al)中的溶解度较大(达到4.5%),随着压力的增加,Cu在α(Al)中的溶解度增大,这与本课题组的前期研究[17]是一致的. 图7 不同条件下α(Al)基体的显微硬度 Fig. 7 Micro-hardness of α(Al) matrix in alloys under different... and mechanical properties was investigated. The microstructure and micro-hardness of Al-5.0Cu-1.0Fe alloy treated by compound field (combination of 50 MPa pressure field and 800 W ultrasonic field) were......
the value of the matrix one. Key words: electron beam surface alloying; γ-TiAl alloy; Ti5Si3; microstructure; micro-hardness hardness Ti5Si3 intermetallic phase were fabricated on γ-TiAl substrates precoated with silicon powders by means of electron beam......
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microstructure and properties were discussed by means of splat analysis. Microstructure, surface roughness, micro-hardness and fracture toughness for WC-10Co4Cr coatings were characterized by SEM, roughness tester and micro-hardness tester. The results show that micro-hardness and density for WC-10Co4Cr coating decrease with the increase of spraying distance. When spray distance is 100 mm......
冷却速率对55CrSi弹簧钢的相变组织和显微硬度的影响王晓峰1,陈伟庆1(1.北京市北京科技大学 冶金与生态工程学院)摘 要:针对55SiCr弹簧钢冷却转变过程的组织转变问题,测定了55SiCr弹簧钢的连续冷却转变曲线(CCT),采用金相显微镜及扫描电镜观察不同冷速下的显微组织,测定不同冷速下钢的显微硬度(HV).结果表明:当冷却速率在1~3℃/s时,先析出铁素体和珠光体组织;随着冷却速率的增加,珠光体含量增加;当冷却速率达到5℃/s时,钢中珠光体含量达到最大值.因此,为了得到强韧性较高,性能优良,珠光体含量较......
electron beam welding; microstructure; micro-hardness 钛合金具有优异的物理力学性能,如密度低,强度高,抗腐蚀性能好和超塑性突出等,在航空航天领域得到了广泛的应用.钛合金在航空发动机上主要应用于轮盘,鼓筒及叶片等零件,以减轻发动机的质量,提高发动机的推重比,达到改善发动机性能的目的.Ti60钛合金是一种近α型高温钛合金, 长时服役温度可达到600......
Nb对Zr基块体金属玻璃形成能力与显微硬度的影响曹扬1,陈光1,盛婧1,陈国良1(1.江苏省南京市南京理工大学材料评价与优选设计教育部工程研究中心)摘 要:研究Nb元素掺杂对Zr基块体金属玻璃非晶形成能力与显微硬度的影响.采用水淬法制备直径13mm,长度为50~70mm的Zr基块体金属玻璃.金属玻璃成分为(Zr41.2Ti13.8Cu12.5Ni10Be22.5)100-xNbx(x=0,0.1,1,2,3,5).当Nb元素掺杂量x=5时,XRD和DSC证实所制备样品仍为全非晶.少量Nb的掺杂(x=1)能够显著......
been deposited on the substrates of single crystalline Si, pure Ti and stainless steel 18-8 by a method of vacuum cathode arc deposition(VCAD). The composition, microstructure and micro-hardness... roughness of the films. The maximum value of micro-hardness belongs to the DLC films deposited under the hydrogen pressure of 0.35Pa and the negative bias of 100V. Key words:DLC films; vacuum cathode arc......
are composed of highly dispersed α-Fe and γ-Fe4N, with both of them maintaining nanometer scale. The micro-hardness of them can be as high as900HV. 关键词:high nitrogen austenite; mediate temperature decomposition; γ-Fe4N; TEM; micro-hardness; [全文内容正在添加中] ......
. The micro-hardness of the coatings is HV 825-HV 1 097 as-deposited and increases to HV 1 236 after heat treated. The wear resistance of the coatings is good and the friction coefficient changes from...-P-B4C coatings; microstructure; micro-hardness; wear resistance; high temperature oxidation resistance1 Introduction The copperplate of the mold used in liquid steel casting must have high hardness......
