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国家自然科学基金(50821001)

作品数:16 被引量:40H指数:4
相关作者:闫志刚郑春雷张朋张福成张明更多>>
相关机构:燕山大学东北大学河北科技师范学院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家教育部博士点基金更多>>
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16 条 记 录,以下是 1-10
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Crystallization and thermal fatigue of ZrTiCuNiBe bulk amorphous alloys heated by laser pulses被引量:8
2010年
The crystallization and thermal fatigue behavior of Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloys heated by laser pulses was investigated. The results showed that crystallization occurred even below the crystallization temperature Tx in a low cycle time. Cracks appearred before or after crystallization of the heated area in the sample. The crystallization degree increased with the heating temperature and cycles. An increase in the fatigue cracks number was also observed. The plastic deformation in the heated area of the sample surface occurred, and became more pronounced with cycles and heating temperature.
JING Qin, ZHAO Liang, YUAN Hui, ZHANG Bing, NIU RunBing, ZHANG Jin, LI Gong, MA MingZhen & LIU RiPing State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
关键词:BULKAMORPHOUSCRYSTALLIZATIONPLASTIC
Warm Deformation Behavior of Steels Containing Carbon of 0.45% to 1.26% With Martensite Starting Structure被引量:1
2010年
Warm deformation was investigated for steels containing carbon of 0. 45%,0. 79%, and 1. 26% respeetively with martensite starting structure, using Gleeble 3500 thermomechanical simulator at the temperature ranging from 873 K to 973 K and the strain rate ranging from 0.1 s^-1 to 0. 001 s^-1. The effect of carbon content on the deformation activation energy, Z value and the deformation resistance was analyzed, The results showed that the deformation resistance decreased with increasing carbon content. The peak stress of the steel containing earbon of 1.26% was decreased by 16.2% compared to the steel containing carbon of 0.45% under the same condition. This may be attributed to the weakening effect of solid solution strengthening which outweighs the precipitation strengthening of cementite.
LI Qun WANG Tian-sheng LI Hong-biao GAO Yu-wei LINing JING Tian-fu
Effect of Ag addition on the thermal stability and glass-forming ability of Zr_(35)Ti_(30)Cu_(7.5)Be_(27.5) bulk metallic glass被引量:1
2012年
The thermal stability and glass forming ability (GFA) of Zr35-xTi30Cu7.5Be27.5Agx (x = 0-10) alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and ultrasonic techniques. We found that the addition of 1 at.% Ag can considerably enhance the GFA as indicated by an increase in the critical glass dimension from 15 mm in the Zr35Ti30Cu7.5Be27.5 alloy to 20 mm in the Zr34Ti30Cu7.5Be27.5Ag1 alloy. However, with the addition of more Ag the supercooled liquid region (△Tx) and y parameter (defined as Tx/(Tg+Tl)) drastically decreased from 155 K and 0.436 to 76 K and 0.363, respectively, resulting in a decrease in the GFA. Additionally, the elastic constant (the ratio of shear modulus to bulk modulus or Poisson's ratio) was also used as a gauge to evaluate the GFA in Zr35-xTi30Cu7.5Be27.5Agx alloys.
ZONG HaiTaoZHANG XinYuLI LiXinBIAN LinYanLIANG ShunXingTAN ChunLin
关键词:玻璃形成能力大块金属玻璃X射线衍射仪差示扫描量热体积弹性模量
Stable structure of Zr_(49)Cu_(44)Al_7 metallic glass matrix composite with CuZr phase under high pressure up to 40.8 GPa被引量:1
2011年
Ternary Zr49Cu44Al7 metallic glass matrix composite rods with CuZr nano-phase,exhibiting an elastic strain of 1.6% and a high strength of 1.78 GPa,have been manufactured. The structural evaluation of the ternary metallic glass matrix composite under high pressure has been investigated using angle dispersive X-ray diffraction with a synchrotron radiation source. The investigation shows that the amorphous matrix structure is stable under pressures up to 40.8 GPa at room temperature. No pressure induced CuZr nano-phase disappearing or growing was detected. According to the Bridgeman equation of state,the bulk modulus B0 =115.2 GPa has been obtained.
LI GongLIU RiPingLI YanChunLIU Jing
关键词:高压力玻璃基同步辐射光源X射线衍射
高压下TiN的结构转变、弹性和热力学性质的第一性原理计算(英文)被引量:1
2012年
利用基于密度泛函的第一性原理,计算了高压下TiN的结构转变、弹性和热力学性质。计算结果表明:在压力作用下,TiN经历了从NaCl型结构到CsCl型结构的转变,转变压力为348GPa;TiN的弹性系数随着压力的增加呈线性增加规律。此外,还给出了德拜温度和热容量这两个重要热力学量与温度和(或)压力的依赖关系。
郝爱民周铁军朱岩刘鑫
关键词:热力学性质第一性原理计算
Electrochemical corrosion and oxidation resistances of Zr_(60)Ni_(21)Al_(19) bulk amorphous alloys被引量:4
2010年
Electrochemical corrosion and oxidation resistances of Zr 60 Ni 21 Al 19 amorphous alloy were studied. The ternary amorphous alloy exhibits greater positive potential than its crystalline counterpart and 0Cr19Ni9Ti stainless steel. Its weight loss result measured in 2 mol/L HCl solution is in agreement with the potentiodynamic curve. But there is no obvious difference in the oxidation resistances between Zr 60 Ni 21 Al 19 amorphous and its crystalline alloys. They both exhibit high oxidation resistance.
JING QinZHANG BingZHANG JinMA MingZhenLIU RiPing
关键词:OXIDATION
Microstructure and Mechanical Properties of Backward-extruded Mg-Zn-xCa Biomaterials
The Mg-1.0Zn-xCa (x=0.2, 0.5, 0.8, 1 wt. %) alloys were prepared by zone solidification and backward extrusion...
Xuejun LiHui LiShuangshuang ZhaoNing MaQiuming Peng
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38CrMoAl钢表面超细贝氏体组织的研究被引量:7
2011年
研究了38CrMoAl钢表面获得超细贝氏体组织的热处理工艺及其组织结构特征。首先利用自行设计的滴注式可控气氛全自动渗碳炉,在930℃对该钢渗碳8h,使钢表面的碳的质量分数达到0.85%,渗层深度为2mm。将经过渗碳热处理的试样加热到930℃保温20min进行奥氏体化处理。然后直接淬入温度分别为230、255和280℃的盐浴中,并分别保温0.5、1、2、4、10h后空冷。利用光学显微镜、透射电镜、X射线衍射仪及显微硬度计对热处理后38CrMoAl钢渗碳层的组织和性能进行分析研究。结果表明,该钢经过230和255℃保温一定时间后均获得较佳的组织结构,其组织特征是,表层是超细贝氏体组织,由平均尺寸为80~120nm的贝氏体铁素体层片和分布于片问平均厚度为几纳米到几十纳米的残余奥氏体膜组成;过渡层是超细贝氏体和马氏体的混合组织;心部是马氏体组织。这种超细贝氏体的滚动接触疲劳性能明显优于常规淬火回火状态下的齿轮材料。
张朋张福成闫志刚郑春雷王天生郑炀曾
关键词:38CRMOAL钢超细晶贝氏体渗碳
Corrosion behavior of bulk metallic glasses in different aqueous solutions被引量:6
2010年
The corrosion behavior of as-cast fully amorphous, structural relaxed amorphous and crystallized Fe65.5Cr4Mo4Ga4P12C5B5.5 bulk metallic glasses (BMGs) in NaCl, HCl and NaOH solutions was investigated by electrochemical polarization and immersion methods. X-ray photoelectron spectroscopy measurements was used to analyze the changes of the elements on the alloy surface before and after immersion in various solutions. The corrosion resistance of the Fe65.5Cr4Mo4Ga4P12C5B5.5 BMG was better than its structural relaxation/crystallization counterparts and common alloys (such as stainless steel, carbonized steel, and steel) in the selected aqueous solutions. The high corrosion resistance of this alloy in corrosive solutions leads to the formation of Fe-, Cr- and Mo-enriched protective thin surface films.
LI Gong, HUANG Lei, DONG YanGuo, HE GuoWei, QI Li, JING Qin, MA MingZhen & LIU RiPing State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
关键词:FE-BASEDBULKMETALLIC
Effect of super-high pressure on microstructure and mechanical properties of Mg_(97)Zn_(1)Y_(2) alloys被引量:1
2016年
Super-high pressure(SHP)technique plays an increasing role in the fields of materials science and engineering.Herein,the Mg_(97)Zn_(1)Y_(2) alloy was heat-treated under SHP(6 GPa)by cubic-anvil large-volume press with six rams for 2 h in the temperature range of 500–1200℃.The microstructure and mechanical properties were investigated.The results indicated that the as-cast sample consists of α-Mg equiaxed dendrites and continuous lamellar long period stacking ordered(LPSO)phase in grain boundaries.After the SHP treatment,the LPSO phase is gradually replaced by eutectic phase(Mg,Zn)_(3)Y with increasing temperature.The microhardness and strength of sample prepared at 1100℃ under SHP treatment are significantly improved compared with the as-cast one at room temperature.The improved mechanical behaviors are mainly attributed to LPSO phase kink-banding strengthening at low temperature and the precipitation strengthening of a large amount of fine(Mg,Zn)_(3)Y particles at high temperature after SHP treatment.It reveals the SHP is an effective approach to prepare high performance Mg alloys.
Hui FuNa LiuZhiwei ZhangQiuming Peng
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