The optical observation results of neocrystallization nucleation and growth of fine fully lamellar (FFL) α 2/ γ microstructure of a TiAl based alloy in rapid heating cyclic heat treatment process were reported. The ...The optical observation results of neocrystallization nucleation and growth of fine fully lamellar (FFL) α 2/ γ microstructure of a TiAl based alloy in rapid heating cyclic heat treatment process were reported. The characteristics of α+γ→α transformation under rapid heating conditions were analysed. A model for explaining the nucleation and growth mechanism of FFL α 2/ γ microstructure was proposed.展开更多
Heat treatment plays an important role in tailoring the mechanical properties of powder-metallurgy(PM)titanium alloys.However,only limited work about the rapid heat treatment(RHT)of PM titanium alloys has been reporte...Heat treatment plays an important role in tailoring the mechanical properties of powder-metallurgy(PM)titanium alloys.However,only limited work about the rapid heat treatment(RHT)of PM titanium alloys has been reported.In this work,RHT was applied to PM Ti-5Al-5Mo-5V-1Cr-1Fe alloy after hot rolling to study the evolution of its mechanical properties and the influence of residual pores on its properties.Through hot rolling and annealing,a fine and uniformα+βstructure with few residual pores is ob-tained.During RHT,the primaryαdissolves gradually and completes in theβregion,and theβgrains then grow,resulting in the continuous decrease in elongation after aging.Moreover,the tensile strength first increases and then decreases with increasing RHT temperature,owing to the increase in volume fraction of secondaryαinα+βregion and theβgrain growth inβregion.In contrast to the RHT of cast-and-wrought titanium,the negative influence of residual pores lowers the RHT temperature for obtaining the highest tensile strength to a temperature below theβ-transus temperature.Despite the negative influence of the residual pores,retained primaryαand fineβgrains with fine secondaryαinside contribute to achieving a good strength/ductility balance(1570 MPa and 6.1%,respectively).Addi-tionally,although at higher cycles to failure,the negative influence of residual pores increases as it affects the crack initiation zone at the subsurface,the good resistance of secondaryαto fatigue crack propaga-tion still enhances the fatigue strength considerably(about 300 MPa).This work suggests a cost-effective strategy to produce titanium alloys with high performance.展开更多
奥沙利铂是多种恶性肿瘤治疗的基石药物。超敏反应是奥沙利铂令人困扰的不良反应之一,可能危及患者生命,常迫使医师停用奥沙利铂,转寻其他替代方案,而这些替代方案可能效果更差、耐受性更低和(或)价格更昂贵。奥沙利铂超敏反应主要表现...奥沙利铂是多种恶性肿瘤治疗的基石药物。超敏反应是奥沙利铂令人困扰的不良反应之一,可能危及患者生命,常迫使医师停用奥沙利铂,转寻其他替代方案,而这些替代方案可能效果更差、耐受性更低和(或)价格更昂贵。奥沙利铂超敏反应主要表现为经典的Ⅰ型过敏反应,另外还包含细胞因子释放反应及混合型。临床上最关注的是严重过敏反应的管理以及针对发生超敏反应后奥沙利铂再挑战的问题。因此,本专家组基于国内外循证医学证据,结合临床实践经验,对奥沙利铂超敏反应的定义、临床特征、诊断、分类与分级标准、处理以及再挑战进行充分的评估与讨论,最终形成《奥沙利铂超敏反应全程管理中国专家共识(2024年版)》,以便进一步规范对奥沙利铂超敏反应的全程管理。本共识已在国际实践指南注册与透明化平台(Practice guideline REgistration for transPAREncy,PREPARE)上注册,注册编号为PREPARE-2024CN371。展开更多
The renovated water in the rapid infiltration system (RI) as area for fish and duck farming is feasible. The flesh of fish and duck is edible. The farming of fish for 5 months and duck for 120 - 130 days can be accept...The renovated water in the rapid infiltration system (RI) as area for fish and duck farming is feasible. The flesh of fish and duck is edible. The farming of fish for 5 months and duck for 120 - 130 days can be accepted. It is beneficial to environment and economy, especially in developing countries. The production of fish and duck can make up for the cost of wastewater treatment.展开更多
文摘The optical observation results of neocrystallization nucleation and growth of fine fully lamellar (FFL) α 2/ γ microstructure of a TiAl based alloy in rapid heating cyclic heat treatment process were reported. The characteristics of α+γ→α transformation under rapid heating conditions were analysed. A model for explaining the nucleation and growth mechanism of FFL α 2/ γ microstructure was proposed.
文摘Heat treatment plays an important role in tailoring the mechanical properties of powder-metallurgy(PM)titanium alloys.However,only limited work about the rapid heat treatment(RHT)of PM titanium alloys has been reported.In this work,RHT was applied to PM Ti-5Al-5Mo-5V-1Cr-1Fe alloy after hot rolling to study the evolution of its mechanical properties and the influence of residual pores on its properties.Through hot rolling and annealing,a fine and uniformα+βstructure with few residual pores is ob-tained.During RHT,the primaryαdissolves gradually and completes in theβregion,and theβgrains then grow,resulting in the continuous decrease in elongation after aging.Moreover,the tensile strength first increases and then decreases with increasing RHT temperature,owing to the increase in volume fraction of secondaryαinα+βregion and theβgrain growth inβregion.In contrast to the RHT of cast-and-wrought titanium,the negative influence of residual pores lowers the RHT temperature for obtaining the highest tensile strength to a temperature below theβ-transus temperature.Despite the negative influence of the residual pores,retained primaryαand fineβgrains with fine secondaryαinside contribute to achieving a good strength/ductility balance(1570 MPa and 6.1%,respectively).Addi-tionally,although at higher cycles to failure,the negative influence of residual pores increases as it affects the crack initiation zone at the subsurface,the good resistance of secondaryαto fatigue crack propaga-tion still enhances the fatigue strength considerably(about 300 MPa).This work suggests a cost-effective strategy to produce titanium alloys with high performance.
文摘奥沙利铂是多种恶性肿瘤治疗的基石药物。超敏反应是奥沙利铂令人困扰的不良反应之一,可能危及患者生命,常迫使医师停用奥沙利铂,转寻其他替代方案,而这些替代方案可能效果更差、耐受性更低和(或)价格更昂贵。奥沙利铂超敏反应主要表现为经典的Ⅰ型过敏反应,另外还包含细胞因子释放反应及混合型。临床上最关注的是严重过敏反应的管理以及针对发生超敏反应后奥沙利铂再挑战的问题。因此,本专家组基于国内外循证医学证据,结合临床实践经验,对奥沙利铂超敏反应的定义、临床特征、诊断、分类与分级标准、处理以及再挑战进行充分的评估与讨论,最终形成《奥沙利铂超敏反应全程管理中国专家共识(2024年版)》,以便进一步规范对奥沙利铂超敏反应的全程管理。本共识已在国际实践指南注册与透明化平台(Practice guideline REgistration for transPAREncy,PREPARE)上注册,注册编号为PREPARE-2024CN371。
文摘The renovated water in the rapid infiltration system (RI) as area for fish and duck farming is feasible. The flesh of fish and duck is edible. The farming of fish for 5 months and duck for 120 - 130 days can be accepted. It is beneficial to environment and economy, especially in developing countries. The production of fish and duck can make up for the cost of wastewater treatment.
