基于应用型人才培养的课程体系构建与课程建设

“一个理念（OBE）”“一种模式（CDlO）”和“三项举措”构成的“113”人才培养新体系体现了OBE理念与《华盛顿协议》的工程教育认证标准及CDlO工程教育模式的契合性，为实施OBE理念、CDlO教育模式和实现应用型人才的培养提供了措施保障。沈阳化工大学机械工程学院从OBE理念出发，结合学校的定位、特色和学生实际，确定了培养目标和相应的课程体系，并以CDlO教育模式下的工程产品或系统平台为节点，把知识关联起来，逐级开展项目教学，以期达成培养目标，培养高素质应用型人才。     

Dry sliding wear behavior of extruded Mg-Sn-Yb alloy

The dry sliding wear behavior of extruded Mg-9Sn and Mg-9Sn-3Yb alloys through pin-on-disc configuration was investigated at room temperature. Coefficient of friction, wear rate and wear resistance of extruded Mg-9Sn and Mg-9Sn-3Yb alloys were measured within a load range of 20–240 N and 20–380 N at a sliding velocity of 0.785 m/s, respectively. The wear tracks, worn surface and wear edge were observed using a scanning electron microscope and an energy dispersive X-ray spectrometer. The results indicated that wear rate, coefficient of friction and wear resistance changed with increasing applied load due to different wear mechanisms. Six wear mechanisms, namely adhesion, abrasion, oxidation, delamination, thermal softening and melting, were observed for both extruded alloys. The extruded Mg-9Sn-3Yb alloy exhibited good wear resistance compared with extruded Mg-9Sn alloy, which was mainly attributed to a large number of volume fraction of Mg2 Sn particles, the formation of thermal stable Mg2(Sn,Yb) particles and good elevated temperature mechanical properties.     

Mg97Zn1Y2合金的摩擦磨损性能研究

研究了铸态Mg97Zn1Y2合金的室温、高温力学性能和干摩擦条件下摩擦磨损行为,并与AZ91合金进行了对比.结果表明:室温下AZ91合金的屈服强度要高于Mg97Zn1Y2合金,但高温下Mg97Zn1Y2合金较AZ91合金表现出更好的热强性,当温度超过150 ℃时,AZ91合金的屈服强度急剧下降,Mg97Zn1Y2合金则下降较少.Mg97Zn1Y2合金由轻微磨损向严重磨损的转变点明显滞后于AZ91合金,相同载荷范围内Mg97Zn1Y2合金磨损表面的温升要低于AZ91合金,其原因是Mg97Zn1Y2合金中的金属间化合物Mg12YZn较AZ91合金中的Mg17Al12相具有更佳的热稳定性.     

Morphological evolutions of cast and melt-spun Mg_(97)Zn_1Y_2 alloys during deformation and heat-treating

Mg_(97)Zn_1Y_2 alloy has been studied as an elevated temperature creep resistant Mg-based alloy for nearly ten years.While, the strength of the cast Mg_(97)Zn_1Y_2 alloy with long-period stacking(LPS) structure is lower than that of the commercial AZ91 alloy at room temperature.The microstructure evolutions in Mg_(97)Zn_1Y_2(molar fraction,%) alloys with LPS phase,processed by rolling and annealing the as-cast alloy and rapidly solidifying/melt-spinning and age treating at different temperatures respecti...