Hongchuan JIANG
材料科学技术（英文）
To increase the low-field magnetostriction of TbFe films, the influences of sputtering angles and annealing temperatures on its magnetic and magnetostrictive performances were systematically investigated. With the change in sputtering angles from 90℃ to 15℃, the in-plane magnetization of TbFe films, at 1600 kA• m-1 external field, is strongly increased. An enhancement in the in-plane magnetostrictive coefficient of the films at 40 kA•m-1 is also observed. A detection of magnetic domains by MFM (magnetic force microscopy) indicates that the easy magnetization direction shifts gradually from perpendicular to parallel to the film plane with decreasing sputtering angles. Annealing can enhance the magnetization and magnetostriction of the TbFe films. However, at too high annealing temperature, both the magnetization and magnetostriction of the TbFe films were suppressed to some extent.
关键词:
TbFe films
,
null
,
null
,
null
,
null
Wenhua SHI
,
Lei ZHAO
,
Liping LUO
,
Qiming WANG
材料科学技术（英文）
The fluctuations of the strained layer in a superlattice or quantum well can broaden the width of satellite peaks in double crystal X-ray diffraction (DCXRD) pattern. It is found that the width of the 0th peak is directly proportional to the fluctuation of the strained layer if the other related facts are ignored. By this method, the Ge-Si atomic interdiffusion in Ge nano-dots and wetting layers has been investigated by DCXRD. It is found that thermal annealing can activate Ge-Si atomic interdiffusion and the interdiffusion in the nano-dots area is much stronger than that in the wetting layer area. Therefore the fluctuation of the Ge layer decreases and the distribution of Ge atoms becomes homogeneous in the horizontal Ge (GeSi actually) layer, which make the width of the 0th peak narrow after annealing.
关键词:
X-ray diffraction
,
null
,
null
,
null
,
null
Huawei ZHANG
,
Lizhong LIU
,
Ping HU
,
Xianghua LIU
金属学报(英文版)
Residual stress developed during the rolling process of tailor rolled blank (TRB) can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigated by means of numerical simulation and experiments taking U-Channel as an example. TRBs were annealed by the annealing process (700℃, holding time 10h), then stamping and springback processes of unannealed and annealed TRBs were simulated, and corresponding experiments were also carried out. Effects of the transition zone length, the blank thickness, the friction coefficient and the die clearance on the springback of TRB were analyzed. The results demonstrate that the springback of TRB annealed at 700℃ for 10 h reduces significantly. For unannealed and annealed U-Channels, the springback of TRB U-Channel is in direct proportion to the die clearance and is in inverse proportion to the transition zone length, the blank thickness and the friction coefficient. Springbacks of the thinner monolithic (uniform thickness) blank, the thinner side of TRB, the thicker side of TRB and the thicker monolithic blank are sorted in descending order.
关键词:
Tailor rolled blank
,
null
,
null
李志燕
,
夏晓洁
,
吴国清
,
黄正
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2015.03.012
对退火处理后的Ti-55531钛合金α片层宽度、β晶粒尺寸、晶界α相不连续度和针状α相比例等特征进行了定量表征和统计分析,探讨了随着退火温度的升高,Ti-55531钛合金显微组织及其力学性能的相关性.结果表明,在β相区退火处理,退火温度的升高将引起晶内α片粗化长大,平均β晶粒尺寸从86μm增大到210 μm,晶界不连续度降低,针状α相的相比例先降低后升高.β晶粒尺寸与延伸率、静韧度、裂纹形成功负相关,与裂纹扩展功正相关;晶界不连续度与静韧度正相关;针状α相比例与屈服强度正相关.
关键词:
近β钛合金
,
退火
,
显微组织
,
统计
谢轻
,
史文
,
杨洪刚
,
刘仁东
,
任廷栋
,
李麟
上海金属
TWIP钢中由于含有大量的Mn、Si、Al、V等合金元素,导致钢板在退火过程中表面产生大量氧化物,严重影响了其连续热浸镀锌性能.采用热力学计算方法,在考虑元素的实际活度的基础上,预测了露点、退火温度、退火气氛氢气含量对表面氧化物形成情况的影响,预测结果将对提高TWIP钢镀锌性起到一定的指导作用.
关键词:
TWIP钢
,
镀锌
,
热力学计算
,
氧化
,
退火
杨琼
,
王传彬
,
章嵩
,
张东明
,
沈强
,
张联盟
表面技术
doi:10.3969/j.issn.1001-3660.2010.01.017
采用脉冲激光沉积技术,在Si(100)基片上制备了BCN薄膜,研究了沉积温度和退火处理对BCN薄膜组分和结构的影响.利用傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)对制备的BCN薄膜进行了表征.结果表明:沉积温度升高时,BCN薄膜的组分无明显改变.所制备的BCN薄膜包含B-N,C-B和C-N化学键,是由杂化的B-C-N键构成的化合物.真空退火温度为700 ℃时,BCN薄膜结构稳定;大气退火温度达到600 ℃时,BCN薄膜表面发生氧化分解,同时有C≡N键形成,表明C≡N键具有较好的高温热稳定性.
关键词:
BCN薄膜
,
沉积温度
,
退火
,
脉冲激光沉积
